USP-S | Serum

The USP-S | Serum is a Counter-Strike skin that carries the recognizable “CS:GO (legacy)” model lineage into CS2. Introduced as part of Valve’s ongoing armament cosmetics ecosystem, it later became available to CS players through well-known collection and case drops, making it a familiar target for both collectors and competitive users looking for a clean, modern sidearm aesthetic.

With a Classified rarity, the USP-S | Serum sits above standard weapon finishes, typically making it less common than base-tier skins. While exact drop probabilities are not publicly guaranteed for every player session, Classified items are generally considered relatively difficult to obtain compared with lower rarities—especially outside of collection-focused purchasing or repeated case openings.

Players can find the USP-S | Serum in multiple condition tiers, with a float range of 0.00 to 0.25. That includes Factory New, Minimal Wear, and Field-Tested versions. StatTrak™ is available, allowing kills to be tracked on the weapon, while Souvenir versions are not available, keeping this skin aligned with standard case drop formats.

Visually, the skin is built around the “Serum” finish, which showcases a graphic, high-contrast design meant to look sharp under CS2 lighting. The pattern details follow the skin’s established layout (paint index 221), offering a sleek, modern appearance that appeals to players who prefer bold finishes without drifting into overly chaotic artwork.

To obtain the USP-S | Serum, players typically look through its case and collection pathways. It’s found in The Arms Deal 2 Collection and appears in CS:GO Weapon Case 2, since legacy skins like this one are often made accessible through these rotating drop systems.

In the community, the USP-S | Serum is often viewed as a strong “everyday” Classified option: it’s visually distinctive, but still practical as a main-hand or backup pistol. Because StatTrak is available and the float range supports a range of wear grades up to Field-Tested, it remains a popular choice for players who want a premium look and optional kill-tracking without needing the most rare tier skins.