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Flip Knife Doppler skins are among the most traded knives in CS2, and Phase 4 is consistently one of the most sought‑after. Its deep black base with vivid blue highlights creates a clean, striking look that holds value well. This guide covers everything you need to know about pricing, pattern identification, and where to buy or sell with zero fees on CSBoard.
The Doppler finish has 4 phases, each tied to a range of pattern indexes. Phase 4 indexes typically run from 418 to 617, producing predominantly blue and black. The Flip Knife Doppler in Phase 4 stands out for its high contrast, while the Flip Knife Gamma Doppler Phase 4 adds cyan and emerald accents.
Nearly full blue tip with clean black spine — minimal green tint.
Maximum cyan coverage on playside, almost no dark spots.
Symmetrical blue on both sides; great for backside enjoyers.
Prominent emerald green stripe through the middle.
Budget-friendly Phase 4 with strong blue on inspect side.
| Classic Doppler P4 | Gamma Doppler P4 | |
|---|---|---|
| Colors | Blue / Black | Cyan / Emerald / Black |
| Price Range (FN) | $800 – $1,200 | $1,000 – $1,500 |
| Best Float | 0.00 – 0.03 | 0.00 – 0.02 |
| Liquidity | Very high, several daily listings on CSBoard | High, moves 48h on average |
| Pattern Index Range | 418 – 617 | 418 – 617 |
Zero fees · Instant USDT payout · No KYC — live Doppler listings updated in real‑time on CSBoard.
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