[50Pcs Silicone Hole Plug]: Package includes 50pcs black silicone hole plugs, enough quantity for your daily use and replacement. [Silicone Material]: These hole covers made of silicone material, soft and flexible, are used to seal holes tubes, waterproof and dust proof, easy to fit most holes. [5 Sizes Flexible Stopper]: There are 5 sizes about our hole plugs, head diameter: 0.51 inch(1.3cm), 0.43 inch(1.1cm), 0.41 inch(1.05cm), 0.35 inch(0.9cm), 0.31 inch(0.8cm), bottom diameter: 0.37 inch(0.95cm), 0.33 inch(0.83cm), 0.3 inch(0.75cm), 0.22 inch(0.55cm), 0.16 inch(0.4cm), height: 0.39 inch(1cm), 0.39 inch(1cm), 0.39 inch(1cm), 0.33 inch(0.85cm), 0.28 inch(0.7cm). Each size contains 10pcs, you can choose size for you need [Easy to Use]: Caps of black silicone rubber hole plug designed for easy installation and removal, no tools required. [Widely Used]: Our silicone bottle seal plugs can be used as waterproof plugs, sealing plugs, test tube plugs, rubber bulkheads, covers, cylinder plug heads, threaded rubber plugs.