Earring backs material: the earring backs are made of soft rubber, lightweight and comfortable to wear and do not irritate or damage your skin. Including packaging: contains 400 pieces earring plugs, 2 sizes available, which can match different earring styles and are enough for your replacement and replacement for long-term use to replace damaged ones. LIGHTWEIGHT & EASY TO WEAR Easy to grip, each earring is non slip and won't fall off during your daily activities. You can use it for a long time. Small size: each earring is 4 x 4 mm, large size: each earring is 4.8 x 5.8 mm. Suitable for all earring shades: can be used with all your preferred earring styles. For thicker earring stems, we recommend attaching and removing the earring a few times before putting it in your ears. Wide application: earring backs are suitable for different earring styles and also ideal accessories for earring DIY. Note: disinfect them before wearing them on ears; small parts, please keep it away from small children.