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 28‑32mm/1.1‑1.26in 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. Item Type: Scope Eyepiece Eyecup Material: Rubber Size: Approx. 40 x 30 x 16mm / 1.57 x 1.18 x 0.63in 2 x Scope Eyepiece Eyecup