Soft rubber eyecups designed to worn or missing eyepieces on binocular microscopes. One pair of black rubber eye cups with a 30 mm inner diameter that fits standard 29 to 30 mm eyepieces. Simple to install, comfortable for extended use, and durable for routine lab and hobby applications. Key benefits Improved comfort: soft, cushioned rubber reduces pressure around the eyes for longer viewing sessions. Light blocking: creates a snug seal around the eye to reduce stray light and improve contrast during observation. Easy replacement: one pair allows quick swap of worn or missing eyecups to restore proper eyepiece function. Durable and flexible: made from resilient rubber that withstands repeated use without tearing or deforming. Hygienic and low maintenance: removable for cleaning with mild soap and water to maintain a clear viewing surface. Specifications Quantity: one pair (two eyecups) Color: black Material: soft, durable rubber Inner diameter: 30 mm Compatible with eyepiece outer diameters approximately 29 to 30 mm Intended for adult microscope binocular eyepieces and standard laboratory or educational microscopes Performance and fit Elastic opening stretches to grip eyepieces securely and stays in place during adjustment. Soft lip conforms to facial contours, helping to reduce light leakage and improve image clarity at the eyepiece. Designed for stable, repeatable fit on compatible eyepieces without tools. Typical use scenarios Teaching labs and classrooms: damaged eyecups on shared microscopes to improve comfort and hygiene between users. Hobbyists and amateur microscopists: upgrade older equipment to reduce eye strain during extended observation of slides and specimens. Industrial inspection and quality control: maintain consistent viewing conditions on bench microscopes used for component inspection and fine measurements. Installation and care Stretch the eyecup over the eyepiece until it seats firmly against the eyepiece flange. Remove for periodic cleaning with mild soap and water; dry thoroughly before reuse. Inspect for cracks or excessive wear and when to maintain a secure seal and comfortable fit. This pair of rubber eyecups offers a straightforward, practical replacement for 29 to 30 mm microscope eyepieces, improving comfort and viewing consistency across educational, hobby, and light industrial settings.