A-Zoom Practice Ammo Rounds are much more than conventional snap-caps. A-Zoom metal snap-caps are precision CNC machined from solid aluminum to exact size, then hard anodized. This hard anodized surface provides for ultra-smooth functioning and long cycling life. The highly durable dry fire "Dead Cap" can take over three thousand dry fires while protecting the firing pin.Specifications:Manufacturers Number 15117ATotally SafeEliminate Unnecessary Risk!Function Testing, Cowboy ActionTeach or Learn Safe Gun HandlingDry Fire Thousands of Times without DamageHandles just like Real AmmoTough Solid Aluminum Construction Ideal for Training, StorageRedFits:10mm Firearms