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Product Description: Name:Professional noise-cancelling earplugs Material:Nano Silicone Unique Product Design: 1. Shark fin design Prevent falling off comfortably and firmly 2.160° ear design Sleep without gurgling 3. Oval 3-layer structure Noise reduction effect increased by 30% 4. The material is selected from the German nano silica gel Make the earplugs not sticky to gray, and feel delicate Soundproof Sleeping Ear Plugs Earplugs For Sleep Special Mute Soft Slow Rebound Student Anti-Noise Protection Anti Ronco Earplug Features: 1. The earplugs use creative sponge formula and craftsmanship to have a stronger sound insulation effect, and the ears will not rise after long-term wear 2. The earplugs have a high-density micro vent design inside, so the ears are not stuffy and hot, and the noise reduction performance is effectively improved Instructions: 1. Rub the earplugs finely, and rub the earplugs back and forth into a uniform slender strip, the thinner the better (remember not to squeeze the earplugs, the squeeze cannot penetrate deep into the ear canal) 2. Lift the auricle and wear it at the same time, one hand goes around the back of the head and lifts the upper auricle to straighten the ear canal, while the other rotates to slowly insert the rubbed earplug into the ear canal 3. Block for 10~30 seconds, block the bottom of the earplug with your finger for 10~30 seconds, feel the earplug slowly rebound and fill the ear canal