The ★ Flip Knife | Doppler is a Covert knife skin in Counter-Strike 2, available since January 2015 from the Chroma Case. This is the Ruby phase of the finish, distinguished by its specific colourway.

The float range for this finish is restricted to 0.00–0.08, so Factory New and Minimal Wear are the only obtainable conditions on the open market. Battle-Scarred examples are not produced, so the most worn copies still retain a relatively clean appearance.

A StatTrak™ version is available, which tracks confirmed kills made while the skin is equipped and typically commands a premium over the standard finish. Active listings for ★ Flip Knife | Doppler are tracked across 11 marketplaces, with prices spanning $1,380 to $3,000 depending on wear, variant, and seller.