Caliber: .22 LR Sound Reduction: 24 dB Length: 1.44'' Diameter: 0.937'' Materials: 7075 Aluminum Mount: 1/2X28 Thread at Muzzle Includes: (1) Suppressor The Pill Box is the smallest suppressor available for the 22LR cartridge. It is considered a ''last ditch'' item for self-defense and is not designed for the range. It utilizes a special wipe that should last around 50 rounds before needing to be replaced. Sound reduction: 24 dB