DUAL FREQUENCY FILTERING MAKES NOISE "SEAMLESS DRILLABLE" Special high and low frequency sound filter, effectively reduce the impact of sound waves on the eardrum, double-layered umbrella structure design, CLOSED and LAMINATING. 30S SLOW MEMORY REBOUND Select foamed PU material, safe and healthy, slow memory rebound, ease the ear canal discomfort caused by rebound too fast. Dense air holes, layered to reduce noise, keep the ear canal breathable and comfortable, soft and comfortable, wearing no foreign body sensation. NON-DISPOSABLE, WATER WASHABLE REUSE Both silicone and foam materials can be washed, and can be reused after being fully dried, which is convenient for and has a long service life. BLOCK OUT THE NOISE, PROTECT YOUR HEARING, AND ENJOY A GOOD NIGHT'S SLEEP! Noise Cancelling Ear Plugs Are Perfect for Sleeping, Construction, Concerts, Hunting, Ear Protection, Snoring, and General Hearing Protection From All Types Of Loud Activity Name: Noise reduction earplugs Scale: 1:8 Control Channels: 2 Channels Max Speed: Soundproof Earplugs For Sleep Noise Reduction Sound insulation, noise reduction Can be washed repeatedly Wear it for a long time will not make the ears swelling Suitable for people who has trouble in sleeping, learning, and environmental noise. Colour:As shown Material:Silica gel Size:Aircraft: 1.461 x 2.383cm(A) Package Contents: 1 set x noise reduction earplugs 1 x plastic storage box Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.