Ergonomic Aluminum Case: The portable earplug case keychain is made of high quality aluminum alloy with exquisite craftsmanship, which is very sturdy, durable and fully functional. Excellent Sealing Performance: Each earplug case is equipped with a tight rubber sealing ring to ensure that the inside is protected from moisture, dust and dirt, keeping it clean, safe and dry. Small and Lightweight Size: The earplug case measures 1.65 long * 1.05 inch in diameter / 4.19 * 2.67 cm, which is very cute and convenient, waterproof and pressure resistant. Light and easy to carry. Perfect for travel and any outdoor activities. Wide Range of Uses: The metal box can be used not only to store earplugs, but also to store pills, medicines, jewelry, earrings, necklaces, etc. It is also a good choice to use it as a medicine case, pill box or jewelry box with keychain. You don't have to worry about any loss, very upscale and practical. Convenient to Carry: There is a keychain on the lid, you can hang it on a key chain, belt loop, handbag, golf bag or pocket wallet. It will be a great help for people who often go out.