Buler Creek's Flip-Open lens cover design with clear windows for fast target acquisition at close to medium ranges. The lenses are crafted of optical-grade polymers for optimum clarity and light transmission, creates a weather-resistant seal and silent, spring-loaded operation. Ambidextrous open and close. For objective and ocular lenses. Type: Objective/Eye Cover Finish: Black Series: See Thru Scope Cover Material: Polymer Dimensions: 40.64mm-42.92mm Mount Type: Slip On Scope Model: Size 5