LEGO Ninja Kai Key Chain 851351-1
LEGO Ninja Kai Key Chain (851351-1) is estimated at about $9 sealed as of Sep 2026 (retail $6). Retired 2016 · 2015 Gear. Track its value and price history.
- Set number
- 851351-1
- Theme
- Gear
- Subtheme
- Key Chains/Ninjago
- Year
- 2015
- Minifigures
- 0
- RRP
- $6
- Market value
- $9 (Estimate, Sep 2026)
- Released
- 2015
- Retirement
- Retired in 2016
Ninja Kai Key Chain value by year
From $5 in 2016 to $9 (Estimate, Sep 2026): +77%. Its highest year was 2018, at $9.
| Year | Value | Change |
|---|---|---|
| Estimate, Sep 2026 | $9 | +34.7% |
| 2025 | $7 | +15.2% |
| 2024 | $6 | −23.9% |
| 2023 | $8 | +26.0% |
| 2022 | $6 | −9.6% |
| 2021 | $7 | −10.8% |
| 2020 | $8 | −16.3% |
| 2019 | $9 | −1.0% |
| 2018 | $9 | +41.6% |
| 2017 | $6 | +25.5% |
| 2016 | $5 | — |
Median of each year's market prices, sealed, in US dollars.
Frequently asked questions
How much is LEGO Ninja Kai Key Chain (851351-1) worth?
LEGO Ninja Kai Key Chain is worth approximately $9 on the secondary market today, based on current listings and completed sales. BrickStats updates this value daily.
Is LEGO Ninja Kai Key Chain retired?
Yes — Ninja Kai Key Chain (851351-1) has been retired by LEGO and is no longer in production. Retired sets have fixed supply, which is why their prices are driven purely by the resale market.
Has LEGO Ninja Kai Key Chain gone up in value?
Yes. Ninja Kai Key Chain launched at $6 and now trades around $9, an increase of 50.3%. See the price history chart for how it got there.
Is LEGO Ninja Kai Key Chain a good investment?
Ninja Kai Key Chain currently trades 50.3% above its $6 retail price, and it is retired, so no new supply is entering the market. Past performance is not a prediction — condition, packaging and how long you hold all affect what a set actually sells for. BrickStats reports the numbers rather than giving investment advice.
Why is LEGO Ninja Kai Key Chain so expensive?
Ninja Kai Key Chain was released in 2015 and has since retired. Once LEGO stops producing a set, the only supply is what is already in circulation, so sealed copies in good condition compete for a shrinking pool of stock. That scarcity, not the parts, is what moves the price.