The USP-S | Check Engine is one of 337 other Pistol skins. The rarity of the skin is Mil-Spec Grade, which makes the Check Engine a pretty common drop with an estimated drop chance of 79.92%.
The Sticker | kennyS (Foil) | Cologne 2016 is one of 6,088 other Sticker items. The rarity of the item is Exotic, which makes the kennyS (Foil) | Cologne 2016 a very rare drop with an estimated drop chance of only 3.2%.