Caliber: .22 LR or .22 Magnum .17 HMR Sound Reduction: 40 dB Length: 5'' Diameter: 1.00'' Materials: 7075 Aluminum and Titanium blast baffle Mount: 1/2 - 28 Thread Includes: (1) Suppressor (1) Assembly/Disassembly Tool The Woodland is the gold standard for those looking for maximum reduction in an incredibly lightweight package. It is user servicable and includes an assembly/disassembly tool. Sound reduction: 40 dB