Butler Creek Element Scope Cap 37-42mm Eyepiece - The Butler Creek Element Scope Caps has taken lens protection to the next level. This modular-interchangeable scope cap can be used in any weather element the hunter is facing. These scope caps are highly rugged and feature a rubber-stretchable sleeve to fit multiple diameters of scopes. The best attribute is the fully customizable, printable, data disk that provides wind and elevation information in either the eye or objective cap. Features Interchangeable disk inserts for changing environments Fully customizable ballistic data disk template printable at ButlerCreek.com 180- & 270-degree lip open positions Strong polymer material to withstand punishment Stainless steel hardware