... 2.eco-friendly 3.shock proof Sound-absorbing sponge (15-90 usually thickness) mm * * 2m, 1 ... on fire plastic or cutting insulation, sound-absorbing sponge products, the newest pyramid sound-absorbing material, case grain surface processing ... shape. Applicable scope: speakers, audition, surveying and mapping, KTV rooms, star-level hotels etc. Used sound-absorbing, sound insulation, shockproof, fire. ...