kz castor
Skip itA concentrated shelf (top 5 take 100% of clicks) — this niche doesn't clear our bar today.
Avg price
Incredible$24.57avg listing price — sweet spot $15–$100
Price range
Incredible$23.39–$25.46cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good668.4avg incumbent reviews — the moat a new listing must climb
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Returns
Okay3.1%return rate — above 5% kills the launch gate
Growth
Okay+8.7%90-day search growth — must beat 0% to launch
Conversion
Okay2.1%search→purchase rate — share of searches ending in a sale
Market size
Bad$57K$57K/yr · 110K searches
Competition
Bad100%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, kz castor is a $57K/yr Amazon United States market (110K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 33/100.
Data updated Jul 22, 2026 · scored weekly · How we score niches
kz castor market data
- Units sold / yr
- 2K–2K
- avg 100–250/product
- Revenue / yr
- $37K–$49K
- units × avg price
- Conversion rate
- 2.1%
- Avg BSR
- #304
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 80%
- Out of stock
- 0.0%
- Avg brand age
- 37 months
- Avg seller age
- 200 days
Competition & brand share
The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack.Brands
2 flat
Sellers
4
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
100%
Top 20: 100%
Open market
0%
- CCA77%
- keephifi23%
- Open — no brand owns it (0%)
Demand
Weekly Amazon search volume, last 25 weeks — +8.7% search growth over the last 90 days.Top kz castor search terms
- kz castor pro52K/yr
- kz castor50K/yr
- kz castor bass5K/yr
- kz castor pro bass3K/yr
Top kz castor products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 5 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
CCA KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable CableBlack with Mic
CCA$25.464.5★257 rev
in Ear Monitor Headphones KZ Castor Improved Bass HiFi Earphone Sound Tunable Noise Isolating IEMs Dual-Dynamic Driver Wired Earbuds with Detachable Cable for Singers Musicians
keephifi$23.394.4★1,656 rev
KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable Cable
CCA$25.424.4★261 rev
KZ Castor in Ear Monitor Headphones with Mic HiFi Improved Bass Earphone Sound Tunable Noise Isolating IEMs Dual-Dynamic Driver Wired Earbuds 2PIN-C Detachable Cable for Singers Musicians
keephifi$24.774.4★911 rev
KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable Cable
CCA$23.814.5★257 rev
Newest
by launch dateCCA KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable CableBlack with Mic
CCA$25.46257 rev
KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable Cable
CCA$25.42261 rev
KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable Cable
CCA$23.81257 rev
in Ear Monitor Headphones KZ Castor Improved Bass HiFi Earphone Sound Tunable Noise Isolating IEMs Dual-Dynamic Driver Wired Earbuds with Detachable Cable for Singers Musicians
keephifi$23.391,656 rev
KZ Castor in Ear Monitor Headphones with Mic HiFi Improved Bass Earphone Sound Tunable Noise Isolating IEMs Dual-Dynamic Driver Wired Earbuds 2PIN-C Detachable Cable for Singers Musicians
keephifi$24.77911 rev
Trending
90-day click momentumKZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable Cable
CCA$23.814.5★
CCA KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable CableBlack with Mic
CCA$25.464.5★
KZ Castor in Ear Monitor Headphones with Mic HiFi Improved Bass Earphone Sound Tunable Noise Isolating IEMs Dual-Dynamic Driver Wired Earbuds 2PIN-C Detachable Cable for Singers Musicians
keephifi$24.774.4★
KZ Castor Pro Tunable in Ear Monitor HiFi Improved Bass in Ear Headphone Dual-Dynamic Driver Gaming Earbuds IEM Earphones with 2PIN-C Detachable Cable
CCA$25.424.4★
in Ear Monitor Headphones KZ Castor Improved Bass HiFi Earphone Sound Tunable Noise Isolating IEMs Dual-Dynamic Driver Wired Earbuds with Detachable Cable for Singers Musicians
keephifi$23.394.4★
What buyers say about kz castor
What buyers praise and complain about, mined from review topics.What buyers love
“Awesome sound”
“Great value for money”
“The best bass I've ever heard”
“Overall, these are a great pair of IEMs with impressive sound, good comfort, and a lot of value”
“The fit is also comfortable”
“The fit is also comfortable”
“met my expectations”
“that's just me in line mic worked really well better then expected only problem I have is the stock earbuds that come with it is not the best it irritated my ear canal quite a bit so buy aftermarket ear tips that's the only reason it's getting a 4 star would be a 5 if the stock tips didn't hurt after 30 min”
“Great With Adjustments”
“They seem fairly durable”
What buyers complain about
“Bad quality”
“my left sound went out”
“is that they broke after 3 months”
“the right IEM slowly lost the ability to maintain volume”
“the cable is already starting to go bad. scratchy noise when youre moving around”
“Product came defective right cable doesnt work”
“Not working”
“To the ones that say it lacks bass”
“One of the ear monitors did not work”
“now the connection is loose”
Top return reasons
Common questions
- Is kz castor profitable to sell on Amazon United States?
- The niche generates $57K/yr across 5 tracked products. 90-day search growth is +8.7%. Flapen's verdict: Skip it (33/100).
- How competitive is the kz castor niche?
- 2 brands and 4 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in kz castor?
- Top complaints mined from reviews: Quality-Overall, Audio Quality, Durability. The return rate is 3.1%.
- What does it cost to enter the kz castor niche?
- Listings span $23.39–$25.46; the average listing price is $24.57 (sweet spot $15–$100). The average incumbent carries 668 reviews — the moat a new listing must climb.