Set of 4 - Acoustic Foam Acoustic Studio Soundproofing Corner Wall 12" X 12" X 24" Size: 12" W X 12" H X 24" L 4 Pack = 2 Blocks Acoustic Bass Trap Use for dampening and absorbing low frequency sound waves Good for studios, recording studios, vocal booths, control rooms, your own music room Product Care: Occasional vacuuming For better decoration, can be wrapped with vinyl, linen, or microsuede