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Feature: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information; 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed. 3.Thermal, acoustic and anti-vibration insulation material 4.For basic soundproofing. Provides moderate sound control on walls or ceilings 5.Absorb sound, keep warm, heat insulation, good elasticity ,wall decoration,shockproof,moistureproof,against friction 6.Can be used in residence, redcording studios and home theatres schools,hosipital , automotive, Marine, architectural decoration,household appliance;etc 7.Best Fire-retardant 8.Eco-friendly Acoustic Panels Specification: Material: fiberglass Cloth:UK Flame Retardant standard Level of sound insulation: B1 High sound absorption performance, NRC value: 0.85 Size:30 x 30 x 2.5 cm/11.81 x 11.81 x 0.98 inch(L x W x H) Type: 1cm small massive Installation method: Nail gun or Glue Color: Black Brand name: BQLZR Weight:3850g Package include: 12 x Soundproof Panels