Specifications - Color: Black. - Material: Rubber. - 42mm binoculars cover-eyepiece inner diameter41mm, objective lens inner diameter52mm 50mm binoculars cover-eyepiece inner diameter43mm, objective lens inner diameter60mm - Note:Cover is made of rubber and has a little elasticity. It can be used with a diameter greater than or less than 1 mm -- proof, waterproof and scratch- proof, provide extra protection for your. - Made with high- grade and safe rubber material, rest assured to use, useful and reliable. - This objective lens caps are very easy to install and simple to operate, giving you huge convenience. - Exquisite workmanship, reasonable structure, professional and practical, excellent and. - design and in fine craftsmanship. the best replacement for your old, broken one.