This slug is made with a real 45 ACP tip and a plastic adapter .68 cal, especially deigned for the Umarex HDS68 and HDR68 paintball marker. With 16.00 grams, it's certain to hit hard on the target. This slug can be used with the 7.5j version but it's more suited for the 16j or more markers. The aerodynamic shape makes it extremely precise. The plastic adapter is designed to separate on impact for more devastation on the target. The materials are LEAD, COPPER and PLASTIC.