★ Ursus Knife | Doppler | Phase 4

It is one phase of the Ursus Knife Doppler finish, released on March 13, 2019. It drops from the Prisma Case as a rare special item. The Ursus 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 $530 on June 27, 2025 and trades 61% below that peak. It is up 2.8% over the past year and down 14% over 90 days. Over the past year it traded between $190 and $325. Its all-time low was $154, on October 24, 2025. The CS2 price history API carries the full Ursus Knife | Doppler (Phase 4) (Factory New) price history.

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

Steam asks the most at $392, 90% above the cheapest Factory New listing on Youpin.

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. Black Pearl is the most expensive phase at $650, and Phase 3 the cheapest at $199.

19 Factory New copies are listed for sale across the four marketplaces. 20 Factory New copies sold in a recent 7-day window. Factory New is 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 Ursus Knife index.