★ Butterfly Knife | Doppler Phase 4 (Factory New)

The ★ Butterfly Knife | Doppler Phase 4 (Factory New) is a Covert ★ knife finish built from a mostly blue marbled pattern layered over black. Factory New covers the 0.00–0.07 band of the float scale, the cleanest grade available, and here that marbling reads at its sharpest.

Design

Phase 4 leans into a mostly blue marbled swirl set against a black base, one of four numbered Doppler phases that Valve locks in at generation. It carries the flavor line "Getting lost in its color can prove fatal," which fits the swirling finish well.

★ Butterfly Knife | Doppler Phase 4 (Factory New) Float and Wear

Doppler is float-capped between 0.00 and 0.08, so only Factory New and Minimal Wear ever exist for this phase — it never ages past a near-mint look on any copy. At Factory New the blade sits at the very bottom of that range, giving the blue marbling its crispest, most legible edges. In float terms, this grade runs 0.00–0.07.

Butterfly Knife | Doppler Phase 4 Rarity

Rarity: Covert ★ — the gold-tier rare special ("knife") slot, not a regular Covert weapon skin. Landing one at all is the hard part; which phase and wear it lands on comes after that.

Butterfly Knife | Doppler Phase 4 Case and Collection

This phase comes from the Spectrum Case and the Spectrum 2 Case, the two boxes that carry the Doppler line for this knife. The rare-special ("knife") tier as a whole lands around 0.26% per case opening, which is why most buyers grab theirs on the market instead of chasing a fresh drop.

Butterfly Knife Doppler Phases

Doppler splits into several phases, and this copy is fixed as Phase 4 for good — the phase never changes with wear or trading. The three gem phases, Ruby, Sapphire, and Black Pearl, sit well above the numbered Phase 1-4 lineup in price. Among the numbered phases themselves, the most saturated ones get the most attention, and Phase 4's deep blue marbling is one of the two most sought-after alongside Phase 2's pink.

StatTrak & Souvenir

A StatTrak™ version of this knife exists and permanently tracks confirmed kills through any trade or sale. There's no Souvenir version at all — knives never appear in Major-tournament souvenir packages, regardless of case or phase.

Butterfly Knife | Doppler Phase 4 Price

Factory New sits at the top of this phase's own price ladder, ahead of Minimal Wear, and the phase overall lands in the high-end range for this knife given how thin the market is for Doppler copies. It's available to buy on Skin.Land with instant delivery and no hidden fees.

FAQ

What case is the Butterfly Knife Doppler Phase 4 in?

It comes from the Spectrum Case and the Spectrum 2 Case, the two boxes that have carried this knife's Doppler line. Since the rare-special tier only lands around 0.26% of the time, most buyers pick up a specific phase on the market rather than opening cases hoping for one.

Which Doppler phase is best on the Butterfly Knife?

The gem phases, Ruby, Sapphire, and Black Pearl, sit far above the numbered Phase 1-4 lineup in price. Among the numbered phases, the most saturated colors win out, and Phase 4's deep blue marbling is one of the two top picks alongside Phase 2's pink. Each phase is fixed per copy and never changes with wear.

Does the Butterfly Knife Doppler Phase 4 have StatTrak?

Yes, a StatTrak™ version exists with a permanent confirmed-kill counter that carries through trades and sales. There's no Souvenir version, though — knives are simply never included in Major-tournament souvenir packages, no matter the phase or case.