String Line
MaybeAn estimated 0.3% of orders come back. But products sell for $7.95 on average, outside the sweet spot, so String Line is a Maybe.
- Flapen Score
- 56 / 100Top 17% of 2,225 DIY & Tools niches · +7 vs the category median of 4956
- Market size
- £206K/yr215K searches / yr
- 90-day growth
- +3.9%search demand this quarter
- Competition
- 55%top-5 click share · 15 brands · 83 sellers
Flapen Score
String Line against its category
The dotted line is the DIY & Tools average. Past it, String Line is stronger. Inside it, weaker.
Market
The String Line market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for String Line 215K times last year and spent an estimated £206K. The top 5 brands take 65% of clicks. Demand peaks in Mar–Apr–May. Flapen scores it 56 out of 100, a Maybe.
01 · Demand
An estimated 12.0% of those searches ended in a purchase.
Shoppers searched for this 215K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 12.0% of those searches ended in a purchase. Searches in the last 90 days moved +3.9% against the 90 days before. Searches, conversion and average price together put the market at an estimated £206K a year.
- Searches, last 12 months
- 215K
- Growth, 90 days vs prior 90
- +3.9%
- Conversion, latest week
- 12.0%
- Market size, estimated
- £206Ka year
- Peak month
- April2.3× the quietest month
- Top search term
- string line110K searches a year
02 · Price
A sale here is worth £7.95.
Listings sell for £7.95 on average, from £2.74 to £22.68. Amazon reports units sold in ranges. This niche sold 20K to 25K a year. The average listing sells 750 to 1,000 of them. At £7.95 that is £6K to £8K a year per listing.
- Average price
- £7.95under the $15 to $100 sweet spot
- Price range
- £2.74–£22.68
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 20K–25K
- Units per listing a year
- 750–1,000
- Revenue per listing a year
- £6K–£8K
- Returns
- 0.3%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is low.
43% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 1.7% of listings are out of stock. The average listing ranks #281 within Tarps & Tie-Downs. It carries 785 reviews at 4.40 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 43%
- Prime listings
- 100%
- Out of stock, average day
- 1.7%
- Average rank
- #281in Tarps & Tie-Downs
- Average rating
- 4.40 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 785per listing
- Listings tracked
- 21
04 · Newcomers
2 of last year's 2 launches cleared the first-year sales bar.
2 products launched here in the last 12 months. 2 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 72 months on average, so the names here are established.
- Launched, last 12 months
- 2
- Successful launches
- 2Amazon's first-year sales bar
- Average brand age
- 72 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 22, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Rolson 52606 Brick Line 100 m Green
- Price
- £4.17
- Rating
- 4.2/5
- Reviews
- 1,273
- Age
- 13y ago

Spear & Jackson 10505Z Line and Pins
- Price
- £7.72
- Rating
- 4.4/5
- Reviews
- 926
- Age
- 16y ago

OX Pro Nylon High Vis Builders Line 105m / 350ft - Cyan
- Price
- £6.77
- Rating
- 4.2/5
- Reviews
- 1,403
- Age
- 12y ago

Green 328 Feet Mason Line Braided Brick Line for Building Gardening Marking and DIY Projects
- Price
- £5.50
- Rating
- 4.3/5
- Reviews
- 743
- Age
- 6y ago

Tracer 100m String Line Anti-Tangle Hi-Vis Builders & Bricklaying Line
- Price
- £10.27
- Rating
- 4.5/5
- Reviews
- 162
- Age
- 2y ago
Trending
estimated 90-day click momentum
Orange 328 Feet Bricklaying Line Braided Brick Builders Line Strong String Line for Building Gardening Marking and DIY Projects
- Price
- £5.83
- Rating
- 4.3/5
- Reviews
- 743
- Age
- 2y ago

Draper 100m Orange Ranging Line | Polypropylene Rope on Spool | Bricklaying String | Garden Twine | Chalk Line | Builders Tool | 28821
- Price
- £5.47
- Rating
- 4.6/5
- Reviews
- 309
- Age
- 13y ago

Dekton 100m Brick Line with Holder | High-Visibility 100m Masonry String | Plastic Spindle Handle & Lock | Ideal for Bricklaying & Construction Work
- Price
- £5.11
- Rating
- 4.2/5
- Reviews
- 15
- Age
- 1y ago

Spear & Jackson 10505Z Line and Pins
- Price
- £7.72
- Rating
- 4.4/5
- Reviews
- 926
- Age
- 16y ago

Blue Spot 34638 82m Brick Line
- Price
- £4.70
- Rating
- 4.5/5
- Reviews
- 550
- Age
- 19y ago
Newest
by launch date
Grettz 100m 8 Braid Green Stringline with Weatherproof Anti-Tangle Reel High Visibility Builders String Line for Bricklaying Landscaping & Construction
- Price
- £8.41
- Rating
- 4.4/5
- Reviews
- 63
- Age
- 11mo ago

Grettz 100 m Heavy-Duty 8-Braid Nylon Stringline High-Visibility Yellow Bricklaying & Landscaping Line for Masonry Construction & DIY Projects
- Price
- £8.31
- Rating
- 4.4/5
- Reviews
- 19
- Age
- 11mo ago

Dekton 100m Brick Line with Holder | High-Visibility 100m Masonry String | Plastic Spindle Handle & Lock | Ideal for Bricklaying & Construction Work
- Price
- £5.11
- Rating
- 4.2/5
- Reviews
- 15
- Age
- 1y ago

OX Trade 30m/100 ABS Chalk Reel w/Grip Value Pack - Standard Bold Line / 6:1 Gear Ratio
- Price
- £9.60
- Rating
- 4.4/5
- Reviews
- 260
- Age
- 1y ago

Tracer 100m String Line Anti-Tangle Hi-Vis Builders & Bricklaying Line
- Price
- £10.27
- Rating
- 4.5/5
- Reviews
- 162
- Age
- 2y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 55% of clicks. Leaders hold, but buyers still shop past them.
Brands
15 falling
Sellers
83
Est. top-5 brand share
65%
Top 20: 100%
Est. top-5 click share
55%
Top 20: 99%
Open market
26%
- tenn well16%
- Rolson14%
- OX Tools12%
- Spear & Jackson11%
- Blue Spot Tools11%
- Tracer9%
Demand
String Line search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Mar, Apr, May · busiest ÷ quietest = 2.3×
Search terms
Top String Line search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- string line110K/yr
- builders line25K/yr
- brick line33K/yr
- builders string line11K/yr
- bricklayers line13K/yr
- bricklaying line16K/yr
- stringline4K/yr
- builders string4K/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.
“Poor quality control prior to shipping”
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.
18 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








