Features: Made of soft rubber that does not hurt your stereo microscope. Eyepiece cover design to reduce impact, and better protect your eyes. When working under a microscope, this rubber eyepiece guard can protect the eyes from outside light, and see objects more clearly. Help create the perfect distance between the eye and the reach. An essential microscope accessory to protect your stereo microscope and also your eyes. Three different sizes : 33mm/1.3'' Diameter ,18mm/0.71'' Height Suitable for 32-35mm lens,36mm/1.42'' Diameter ,18mm/0.71'' Height Suitable for 34-37mm lens,33mm/1.3'' Diameter ,30.7mm/1.21'' Height Suitable for 32-35mm lens Package Includes: 2x Rubber Eyepiece Cover Specifications: Material:Rubber S-Size:33mm/1.3'' Diameter ,18mm/0.71'' Height Suitable for 32-35mm lens M-Size:36mm/1.42'' Diameter ,18mm/0.71'' Height Suitable for 34-37mm lens L Size:33mm/1.3'' Diameter ,30.7mm/1.21'' Height Suitable for 32-35mm lens Quantity:2pcs note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.