Auralex PlatFoam - Drum Riser Isolation 2x4x48 Inch Foam (Box of 24)When used as riser support, Platfoam Isolation Foam GREATLY purifies the tone of your sound sources and yields dramatically improved isolation characteristics, thus minimizing sound transmission to neighboring spaces. This is a fast, portable, easy and affordable solution to many of your sound isolation problems! Dimensions: Platfoam: 2" x 4" x 48" pieces of high density foam Box Quantity: Platfoam: (24) pieces per box (will float an 8' x 8' area) (3)