Stiletto Knife | Doppler Phase 4 (Stiletto P4) was added to the game on March 13, 2018, alongside the "Seeing the Light" update. The skin is available in the "Prisma" case.
The blade of the knife and the guard are 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 blue, brown and black creating gradient transitions. The handle remains unpainted.
Float Value of the skin ranges from 0.00 to 0.08, which makes Stiletto Knife | Doppler Phase 4 available only in Factory New and Minimal Wear condition. At levels of wear close to the maximum, the knife has small scratches and abrasions located on the spine and the tip.
The pattern index affects the ratio of colors as well as the location of blue, brown and black areas. Pattern variations with a predominance of blue on the play side of the blade are titled “BTA Blue”. Knives with only blue color on the blade resemble Stiletto Knife | Doppler Sapphire and are titled “Max Blue”.
The quality of Stiletto Knife | Doppler Phase 4 is Covert. The skin has a StatTrak option and is close to phases 1 and 3 in terms of rarity. The skin belongs to the "Stiletto Knife | Doppler" series.
Due to a relatively low price, Stiletto Knife | Doppler Phase 4 became one of the most popular and common skins in the “Doppler” series.