Auralex Acoustics TFusor 3D Sound Diffusor, 5.5 x 24, T'Fusor Acoustic Pack of 4, White-4 Pack (TFUS_4PK) Great for controlling direct reflections, TFusors will help impart a feeling of controlled spaciousness or openness to your room. Diffusion is especially useful for back walls in control rooms, home theaters, and above percussion. They can also be back-filled with Studiofoam or other absorptive material to provide additional absorption. T'Fusors are sized to drop easily into ceiling grids and are wall mountable with pushpins, staples, nails, Tubetak, Velcro, or EZ-Stick Pro Tabs. Made from lightweight, yet sturdy, white thermoplastic. Single Diffusor Actual Size: 23 square x 6 tall