Egg cotton is also known as wave cotton and crest cotton. It is a kind of sound-absorbing cotton. Egg cotton is a kind of sponge that has been specially processed by equipment to form a convex and concave wave shape. Its interior is full of small gaps and semi-open hole structure, which can absorb a large amount of incoming sound wave energy and attenuate the sound wave, reduce the interference and reverberation of indoor reflected sound, and improve the purity of sound. It is a high-performance product of sound-absorbing and noise-reducing materials. It is widely used in KTV, recording studios, theaters, music rooms, machine room silencers, generator silencers, speaker silencers, etc.