★ Flip Knife | Doppler | Phase 4

It is one phase of the Flip Knife Doppler finish, released on January 8, 2015. It drops from the Chroma Case as a rare special item. The Flip Knife Doppler (Phase 4) runs from 0.00 to 0.08 in float, so it comes only in Factory New and Minimal Wear, and it has a StatTrak version.

Factory New peaked at $645 on April 23, 2025 and trades 58% below that peak. It is up 18% over the past year and down 17% over 90 days. Over the past year it traded between $231 and $396. Its all-time low was $173, on October 24, 2025. The CS2 price history API carries the full Flip Knife | Doppler (Phase 4) (Factory New) price history.

Minimal Wear costs 1.4 times as much as Factory New, the cheapest wear.

Skinport asks the most at $327, 22% above the cheapest Factory New listing on CSFloat.

Doppler comes in four phases, Phase 1 to Phase 4, plus three rarer gem patterns: Ruby, Sapphire and Black Pearl. The pattern seed fixes the phase, and each phase trades as its own item with its own price. Ruby is the most expensive phase at $1,259, and Phase 3 the cheapest at $265.

39 Factory New copies are listed for sale across the four marketplaces. 55 Factory New copies sold in a recent 7-day window. Factory New is very liquid and usually sells within hours.

The Doppler (Phase 4) finish also comes on the Bayonet, the Bowie Knife, the Butterfly Knife, the Falchion Knife and 13 other weapons. It counts toward the Doppler (Phase 4) index.