Soundproof earplugs (also known as noise-proof earplugs, soundproof earplugs, noise-proof earplugs, sleeping earplugs and electrostatic earplugs) are generally made of silica gel or low-pressure foam and high-elastic polyester materials. After being inserted into the ear canal, it is in close contact with the external auditory canal to isolate sound from entering the middle ear and the inner ear (eardrum), so as to achieve the purpose of sound insulation and make people have a quiet environment for rest or work and study.
The most common shape of anti-noise earplugs is bullet type. There are also rocket-shaped (T-shaped), trumpet-shaped, cylindrical and tripod patented by Bagu.