Bayonet | Doppler Phase 4 (Bayo P4) was added to the game on January 8, 2015, alongside the “Full Spectrum” update. The skin is available in all “Chroma” cases.
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 blue, brown and black creating gradient transitions. The guard and the handle remain unpainted.
Float Value of the skin ranges from 0.00 to 0.08, which makes Bayonet | Doppler Phase 4 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 on the spine and along the cutting edge.
The pattern index affects the ratio of colors as well as the location of black, green and teal areas. Special or rare variations of the pattern are absent.
The quality of Bayonet | 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 "Bayonet | Doppler" series.
“Doppler Sapphire” is one of the most popular skins for M9 Bayonet. The skin has a very large number of fans, but due to a high price, it is rarely seen in the game.