Check the listing for details. Speaker Sound-Absorbing Cotton Polyester Interior Insulation 40x100cm. Condition: New. Listed at 20.73 USD. Specifications:Size: 40x100cm/15.75''x39.37''(W*L)Color: WhiteFeatures:Speaker sound-absorbing cotton is installed in the speaker to absorb standing waves from the low frequency of the cabinet. After installing the sound-absorbing cotton, will make the bass clearer and strong.The acoustic propagation will make space larger. The amount of sound absorption cotton in a box should be tested actually.When the bass is smeared, install more sound-absorbing cotton. Otherwise, reduce cotton.It is a sound-absorbing cotton dedicated to speakers, flame retardant and .Tips: Because the cotton is soft and elastic, the cotton shape sometimes appears thin when pressed. After natural relaxation, the thickness is 3cm approximately.Package Includes:1 x Speaker Sound-Absorbing Cotton.