Designed to fit the auricle and prevent falling off. Soft elastomer for comfortable sleep. Silica gel and sponge combination for improved noise reduction. Fits different ear canal sizes. Material: Silica Gel + Sponge. Size: 2.5x0.6cm. Color: Red, Blue, Black. Weight: 30g. Features 1. The structure of human cochlea is designed to fit the auricle and prevent falling off. 2. Soft elastomer, which won't hurt your ears during sleep. 3. The combination of silica gel and sponge is adopted to attenuate the impact of sound waves on the eardrum, and the noise reduction effect is greatly improved. 4. It can better fit people with different ear canal sizes. Specifications: Material:Silica Gel + Sponge Size:2.5x 0.6cm Color:Red,Blue,Black Weight:30 g Package Included: 10x Sponge Head 2x Silicone Head