String Line
MaybeBuyers convert on 12.9% of searches. But the products selling today already average 4.6★, so String Line is a Maybe.
- Flapen Score
- 56 / 100Top 17% of 9,536 Tools & Home Improvement niches · +8 vs the category median of 4856
- Market size
- $395K/yr217K searches / yr
- 90-day growth
- +12.1%search demand this quarter
- Competition
- 65%top-5 click share · 14 brands · 40 sellers
Flapen Score
String Line against its category
The dotted line is the Tools & Home Improvement average. Past it, String Line is stronger. Inside it, weaker.
Market
The String Line market on Amazon at a glance
Shoppers on Amazon United States searched for String Line 217K times last year and spent an estimated $395K. The top 5 brands take 81% of clicks. Demand peaks in Apr–May. Flapen scores it 56 out of 100, a Maybe.
01 · Demand
An estimated 12.9% of those searches ended in a purchase.
Shoppers searched for this 217K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 12.9% of those searches ended in a purchase. Searches in the last 90 days moved +12.1% against the 90 days before. Searches, conversion and average price together put the market at an estimated $395K a year.
- Searches, last 12 months
- 217K
- Growth, 90 days vs prior 90
- +12.1%
- Conversion, latest week
- 12.9%
- Market size, estimated
- $395Ka year
- Peak month
- April2.7× the quietest month
- Top search term
- string line71K searches a year
02 · Price
A sale here is worth $14.12.
Listings sell for $14.12 on average, from $5.97 to $37.41. Amazon reports units sold in ranges. This niche sold 25K to 30K a year. The average listing sells 1,000 to 1,250 of them. At $14.12 that is $14K to $18K a year per listing.
- Average price
- $14.12under the $15 to $100 sweet spot
- Price range
- $5.97–$37.41
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 25K–30K
- Units per listing a year
- 1,000–1,250
- Revenue per listing a year
- $14K–$18K
- Returns
- 0.8%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
88% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 4.0% of listings are out of stock. The average listing ranks #20 within Masonry Tools. It carries 624 reviews at 4.59 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 88%
- Prime listings
- 100%
- Out of stock, average day
- 4.0%
- Average rank
- #20in Masonry Tools
- Average rating
- 4.59 starsAmazon United States average 4.42 stars
- Average reviews
- 624per listing
- Listings tracked
- 24
04 · Newcomers
1 of last year's 2 launches cleared the first-year sales bar.
2 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 56 months on average, so the names here are settling in.
- Launched, last 12 months
- 2
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 56 months
Products
Top String Line products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 29, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Mason Line String Reel 260FT 390FT 780FT 1500FT 2300FT Durable Construction Twine for Laying Bricks Blocks Fences in Gardening DIY & Landscaping Projects (Orange 262 Ft)
- Price
- $9.04
- Rating
- 4.6/5
- Reviews
- 302
- Age
- 2y ago

Orange Mason Line String Line - #18 Braided Nylon String - 250 Ft Length - Nylon Twine for Gardening Or Masonry Tools - Perfect Construction String for A String Level Twine String for Gardening
- Price
- $7.35
- Rating
- 4.7/5
- Reviews
- 2,886
- Age
- 3y ago

Romeda Mason Line #18 500 Ft Orange String Construction Twine for Gardening & Masonry
- Price
- $6.39
- Rating
- 4.7/5
- Reviews
- 800
- Age
- 2y ago

LURKA Mason Line String #18 540 Feet Braided Construction Nylon Line with 5 Built-in Levels and Spool Fluorescent String Line for Precision Work DIY and Gardening (Fluorescent Orange)
- Price
- $12.97
- Rating
- 4.6/5
- Reviews
- 377
- Age
- 1y ago

Reloadable Line Reel Mason Line String Line 600 Ft Length Nylon Twine Nylon String for Gardening Or Masonry Tools Twine String for Gardening Yellow
- Price
- $9.92
- Rating
- 4.4/5
- Reviews
- 210
- Age
- 1y ago
Trending
estimated 90-day click momentum
Konvixon 8PCS Mason String Line Set for Bricklaying Alignment & Masonry
- Price
- $37.41
- Rating
- 4.5/5
- Reviews
- 33
- Age
- 6mo ago

Konvixon 10PCS Masonry Line String Set for Bricklaying and Alignment
- Price
- $28.71
- Rating
- 5.0/5
- Reviews
- 34
- Age
- 6mo ago

Mason Line String 260FT 390FT 780FT 1500FT 2300FT Durable Construction Twine for Laying Bricks Blocks Fences in Gardening DIY & Landscaping Projects (Set 3 Colors 262 Ft x 3 Pcs)
- Price
- $8.17
- Rating
- 4.6/5
- Reviews
- 302
- Age
- 1y ago

Mason Line Cord with Handle Reloadable Reel #18 Braided Nylon Line 600 Feet of High Strength Nylon Line for Gardening or Masonry Tools Kite Twine Fluorescent Orange
- Price
- $9.98
- Rating
- 4.4/5
- Reviews
- 60
- Age
- 1y ago

Reloadable Line Reel Mason Line String line with Handle 600 Ft Length Nylon Twine 18 Braided Nylon String for Gardening Or Masonry Tools Outdoor KiteTwine String for Gardening Fluorescent Yellow
- Price
- $9.93
- Rating
- 4.4/5
- Reviews
- 48
- Age
- 1y ago
Newest
by launch date
Konvixon 8PCS Mason String Line Set for Bricklaying Alignment & Masonry
- Price
- $37.41
- Rating
- 4.5/5
- Reviews
- 33
- Age
- 6mo ago

Konvixon 10PCS Masonry Line String Set for Bricklaying and Alignment
- Price
- $28.71
- Rating
- 5.0/5
- Reviews
- 34
- Age
- 6mo ago

Mason Line Cord with Handle Reloadable Reel #18 Braided Nylon Line 600 Feet of High Strength Nylon Line for Gardening or Masonry Tools Kite Twine Fluorescent Orange
- Price
- $9.98
- Rating
- 4.4/5
- Reviews
- 60
- Age
- 1y ago

Mason Line with Handle Reloadable Reel #18 Braided Nylon Line 600 Feet of High Strength Nylon Line for Gardening or Masonry Tools Kite Twine Fluorescent Yellow
- Price
- $9.97
- Rating
- 4.4/5
- Reviews
- 60
- Age
- 1y ago

KAOWQNL #18 Braided Mason Line String 580FT Nylon Twine with Handle Construction String Professional String Line Level Tool Kit with 6 Built in Levels & Storage Bag
- Price
- $12.94
- Rating
- 4.1/5
- Reviews
- 41
- Age
- 1y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 65% of clicks. Leaders hold, but buyers still shop past them.
Brands
14 rising
Sellers
40
Est. top-5 brand share
81%
Top 20: 100%
Est. top-5 click share
65%
Top 20: 96%
Open market
13%
- ACE Supply23%
- GOLDEN COCK22%
- Romeda17%
- LURKA12%
- Generic7%
- BSRHOME6%
- Open — no brand owns it (8 brands, 13%)
Demand
String Line search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Apr, May · busiest ÷ quietest = 2.7×
Search terms
Top String Line search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- string line71K/yr
- mason line32K/yr
- mason line string13K/yr
- construction string10K/yr
- mason string10K/yr
- stakes and string for yard marking6K/yr
- masonry line9K/yr
- mason string line7K/yr
- masonry string lines8K/yr
- construction string line9K/yr
Reviews and returns
What reviews say buyers love and hate about String Line
We read the reviews and the return reasons for every product selling here.
“not well made”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common String Line questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









