Feature: 1. [Effective Sound Insulation] These sound insulation panels effectively eliminate echoes, standing waves and flutter, reducing noise pollution. 2. [Light Weight] Acoustic panels are lightweight and can be installed to doors, walls, windows or ceilings without any tools. 3. [High Density] The high density of our sound insulation board can play a good role in absorbing sound, which is very suitable for use in a quiet environment. 4. [12PCS in A Set] There are 12PCS soundproof panels in our set, which can meet your extensive use needs and give you an absolutely quiet working or living environment. 5. [Wide Application] Soundproofing panels are ideal for professional studios, vlogging, rehearsal rooms, concert halls, podcasts, schools, home theaters, offices, pet halls, and more. Specification: Item Type: Acoustic Panel Material: Cotton Size: Approx. 50 x 50 x 5cm / 19.7 x 19.7 x 2in. Package List: 12 x Acoustic Panel