kikkertsigte 3 9x50Strike Systems binocular sight with magnification from 3 9X zoom. The binoculars are waterproof, dust resistant and do not fog up. It comes with a 1" tube and a size of 50 mm, which increases the view from the binoculars. Mounting rings are not included. If you want to attach to a hardball airsoft shooter, you must use mounting rings with a 21 mm base. If you want to mount it on an air rifle, you must purchase mounting rings with an 11 mm base.