Earring Back Material: Earring backs are made of soft rubber, lightweight and comfortable to wear, and will not irritate or harm your skin. Package Includes: Contains 200 pieces of earring stoppers suitable for various earring styles, enough for your replacement and long-term use to replace damaged ones. Lightweight and Easy to Wear: Easy to hold, each earring back is non-slip and will not fall off during your daily activities. You can use them for a long time. Size: Each earring back is 4 x 4 mm in size. Suitable for All Earring Shades: Can be used with all your favorite earring styles. For thicker earring posts, we recommend putting on and removing the earring back a few times before inserting it into your ears. Quality Service: If you are not satisfied with this product or have any questions, please feel free to contact us. We will do our best to solve the problem. Note: Disinfect them before wearing them on your ears; Small parts, keep away from small children.