Feature:1. IMPROVE THE OBSERVATION EFFECT: After adding scope eyepiece eyecup, there is no interference from external light source, the observation effect is better. Let you get a comfortable using experience.2. MULTIPLE APPLICATIONS: The scope eyepiece eye guard has an inner diameter of 30mm, suitable for 2832mm/1.11.26in microscope eyepieces, monocular and binocular eyepieces and so on.3. PRACTICAL TOOLS: Microscope eyepiece cover helps to create the perfect distance between your eyes and the tentacle, reduces eye fatigue and protects your eyes from stray light and impacts.4. RUBBER MATERIAL: This eyepiece cover is made of premium rubber material, foldable and easy to use. Soft and flexible, not easy to deform, easy to install and remove.5. MULTIFUNCTIONAL: Professional scope eyepiece eye guard cup with compact and lightweight design, will not add extra burden. Easy to store and carry, convenient to use anytime and anywhere.Specification:Item Type: Scope Eyepiece EyecupMaterial: RubberSize: Approx. 40 x 30 x 16mm / 1.57 x 1.18 x 0.63in.Package List:2 x Scope Eyepiece EyecupNote:Manual measurement, please allow some errors.