This is a well made reproduction of a German WWII rubber eye cup for the ZF4 scope as used on the G43 and K43. The eye cup served not only to make shooting more comfortable but also to help reduce the glare from the lens. Yes naturally this piece is made from a good quality rubber as the original. It is only $2.50 to ship this liner anywhere in the US, Canada, Australia, NZ and most of Asia. Postage within the EU is $1.50, all others pay actual postage.