HYPƐAR Sonic Sea are custom-molded earplugs that replace the standard tips on your waterproof in-ear headphones. They create a secure, water-ready seal so you can enjoy music while swimming or training in the pool. 2 custom-molded earplugs that replace the standard tips (XS,S,M,L,XL) that come with your waterproof headphones. (The headphones in the image are not included.) Design: Tube-shaped sound channel with constant diameter. Connection adapted to a pair of optional waterproof In-Ear headphones. Material: Skin-friendly silicone that floats in water. Hardness: 35 Shore A Surface treatment: Skin-friendly anti-bacterial silicone lacquer (transparent) Marking: Red-Right (Red-Right) and Blue-Left Color choice: Red, Blue, Orange, Yellow and Green