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 (2) Additional Pillbox Wipes (1) Pillbox Disassembly Tool The Pill Box Plus is the smallest suppressor available for the 22LR cartridge, with a BONUS. The unit is considered as a ''last ditch'' item for self-defense and is not designed for mag dumps and days of target shooting at the range. The Pill Box uses a special wipe which should last at least fifty rounds minimum before needing replacement.