Skeleton Knife | Doppler Ruby was added to the game on March 31, 2025, in the Spring Forward update and became one of the rare special items in the Fever Case. The skin was created by Valve. The Skeleton Knife appeared in the game in 2019 as part of Operation Shattered Web and first received Chroma finishes in the Fever Case.
The blade is coated with metallic paint and decorated with a pattern of translucent wavy lines resembling clouds of smoke. The color scheme includes various shades of red, forming smooth gradient transitions. The pattern resembles the texture of a ruby. The handle is wrapped in black tape.
The skin's Float Value ranges from 0.00 to 0.08, which makes Skeleton Knife | Doppler Ruby available only in Factory New and Minimal Wear conditions. Even at the highest wear levels, there are almost no noticeable abrasions on the blade.
The pattern index affects the placement of the texture on the blade surface. The gaming community highlights Max Ruby variants with the most uniform coverage on the play side of the blade and a minimal number of dark lines and spots. Typical examples include patterns #936, #375, #244, #29, and #87. Among them, #936, #375, and #244 are considered High Tier patterns.
The quality of Skeleton Knife | Doppler Ruby is Covert. The skin is available in a StatTrak version. The skin is part of the Doppler series. Minimal Wear versions are less common than Factory New ones and may cost more. Their higher price comes from the rarity of the condition, not from a better appearance.