1Premium Material: Telescopes eye cups are made of rubber, which is safe, non toxic, environmentally friendly and durable, and has a long service life. 2Excellent Observation Effect: After adding telescopes eye cups, there is no external light source interference, and the observation effect is better. 3Applicable: Eye Cups have an inner diameter of 27mm/06in, and are suitable for 4248 mm/6589 in microscope eyepieces, monocular binoculars and other eyepieces. 4Eye Protection: Eye cups help to create the perfect distance between eyes and tentacles, aiming to reduce the impact and better guard your eyes. 5Easy to Store and Carry: Rubber eyepiece cover is foldable, easy to carry and store, easy to use, durable and practical.2 x Eye Cups