Butterfly Knife | Doppler Ruby (BFK Ruby) was added to the game on March 15, 2017, alongside the "Take a trip to the Canals" update. The skin is available in cases "Spectrum" and "Spectrum 2".
The blade of the knife is painted with metallic paints and adorned with a pattern of translucent wavy lines resembling smoke. The color scheme of the skin includes various shades of red creating gradient transitions. The design of the skin resembles the texture of the ruby. The handle is unpainted and complemented with brown inserts.
Float Value of the skin ranges from 0.00 to 0.08, which makes Butterfly Knife | Doppler Ruby available only in Factory New and Minimal Wear condition. At levels of wear close to the maximum, the knife has noticeable scratches and abrasions located along the cutting edge.
The pattern index affects the texture overlay. Special or rare variations of the pattern are absent.
The quality of Butterfly Knife | Doppler Ruby is Covert. The skin has a StatTrak option and is not the rarest but one of the most expensive phases in the “Butterfly Knife | Doppler” series.
“Doppler Ruby” is one of the most popular skins for Butterfly Knife. The skin has a very large number of fans, but due to a high price, it is rarely seen in the game.