The cover is mountet with Velcro and is easy to mount and unmount. • Protects your scope from water, dust, etc. • Easy and silent dismounting • Velcro for securing scopecover to rifle • Small: 25-31 cm. Fits up to 50 mm objective • Big: 30-40 cm. Fits up to 60 mm objective • 100% neoprene, 3 mm