Feather Vision Verde Plus lens for the 29mm Optum scope Zeiss glass with a Zeiss anti-glare, oleophobic, and hydrophobic coating Allows for 99.98% light transmission Glass comes pre-installed in a metal lens housing for easy installation Metal lens housing feature a single lead thread for consistent and repeatable installation The lens housing is threaded to accept all 29mm Optum sunshades Available magnifications: 4X, 5X, 6X Made in the USA