1IMPROVE 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. 2MULTIPLE 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. 3PRACTICAL 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. 4RUBBER 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. 5MULTIFUNCTIONAL: 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. 2 xScopeEyepieceEyecup