The ★ Butterfly Knife | Doppler is a Covert knife skin in Counter-Strike 2, available since March 2017 from the Spectrum Case. This is the Sapphire 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 ★ Butterfly Knife | Doppler are tracked across 11 marketplaces, with prices spanning $5,930 to $15,726 depending on wear, variant, and seller.