Comfortable, protective rubber eyecups designed for stereo microscope binocular heads. This accessory kit contains an adult pair of 36 mm rubber eyecups that fit eyepiece tubes sized 34 mm to 37 mm. Key benefits Improved viewing comfort: soft rubber cushions reduce eye strain during extended use. Better light control: snug fit blocks stray light for clearer contrast and less glare. Eyepiece protection: shields lenses from sweat, oils, dust, and abrasion to extend eyepiece life. Secure fit and easy installation: flexible design stretches to fit 34 mm to 37 mm eyepieces and stays in place during adjustments. Product features Function: eyecups for stereo microscope binocular heads to improve comfort and optical performance. Compatibility: fits eyepiece tubes with diameters from 34 mm to 37 mm; designed for adult users and standard stereo microscope binocular configurations. Size: nominal 36 mm eyecup diameter for consistent fit and seal. Material: durable, flexible rubber that resists cracking and maintains shape with repeated use. Performance: conforms to eyepiece shape, provides stable contact, and maintains optical alignment without slipping. Installation and care Installation: slide each eyecup onto the eyepiece rim and adjust until fully seated. No tools required. Cleaning: wipe with a soft cloth and mild detergent if needed. Allow to dry completely before reuse. Maintenance: inspect periodically for wear and when the rubber shows permanent deformation. Practical use scenarios Laboratory microscopy sessions where extended observation requires reduced eye fatigue and consistent alignment. Quality control and industrial inspection tasks that benefit from reduced glare and a stable eyepiece seal. Classroom and educational settings where many users of different heights need a comfortable, hygienic eyepiece solution. Why choose this kit Simple, effective upgrade for existing stereo microscope binoculars that improves user comfort and viewing quality. Designed to match common eyepiece sizes so replacement is straightforward and reliable. Practical accessory for labs, workshops, classrooms, and hobbyists needing durable, comfortable eyecups. Contents One pair of 36 mm rubber eyecups compatible with 3437 mm eyepiece tubes.