dear buyer, becae the 24pcs items are overweight, so we will be divided into 4 parcels. every 6 pieces hope you understand. if you have any problem, please let  know as soon as possible, thank you! 
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<br /> package included：
<br />24 x charcoal acotic wedge foam
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<br />specification:
<br />total size: 30 * 30 * 5cm 12"*12"*2"
<br />thickness: bottom 1.5cm, slot height 3.5cm
<br />material: polyurethane foam
<br />color: black
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<br />feature:
<br />ing polyurethane foam material.
<br />after special treatment device side triangular groove shape formed by the complex process of foaming silencer, sound-absorbing, sound insulation, shock absorption sponge materials.
<br />its interior is full of small voids and semi-open pore structure can absorb a lot of energy incident on the acotic attenuation of sound waves play a role, reducing chamber reflected sound interference and response, improve the purity of sound; noise sound-absorbing material is a high-performance product.
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<br />application:
<br />family noise control walls, pipes, ceilings, etc.
<br />entertainment noise control ktv rooms, walls, ceilings, floors, etc.
<br />workplace noise control light walls, partitions, conference rooms, etc.
<br />indtrial noise control factory walls, roofs, equipment, doors, control room, etc.