Recommended for use with lead airgun pellet and lead shot only. Do not use BB's. BB's can rebound and ricochet and can cause permanent injury, particularly to the eyes. Use appropriate ear and eye protection and make sure your range has a secure and reliable backstop. Size 5.5 x 5.75 x 7.5-Inch, weight 1.9-Pounds, 1 unit/box. Lifetime warranty.