The Erector is made up of clear and black hard-coat anodized aircraft aluminum battles a mount and front cap complimented by a heat treated stainless steel blast baffle. Notice we didn’t mention on outer tube. – No outer tube means more internal volume making the silencer so quiet it’s in a class on it’s own. – This silencer comes with unique tools not a wrench flat. A wrench flat will cause damage to your silencer wrench flasts are what the imposters use. – Configure this silencer with one baffle or all ten to fit the needs of your host firearm and ammunition. The choice is yours…choose wisely. – CALIBER 22 LR – WEIGHT 2.6 oz (fully assembled) – DIAMETER .99 in – OVERALL LENGTH 7.6 in (fully assembled) – ATTACHMENT / MOUNT 1/2-28 – MATERIAL(S) Stainless Steel Aluminum – FINISH(S) Clear Hard-Coat Anodize & Heat Treat (shades of tan) / Black Hard Coat Anodize & Heat Treat