Sabin's Cluster Array consists of eight to twelve units, offering a customizable color palette and coming in lit, direct and unlit versions. The block system uses 9mm felt, with 11 felt colors, and customizable cable, thread and cord colors. NRC rating is above 0.85 and is available in a range of form factors, from 1 1 ft. x 1 ft. to 2 ft. x 4 ft.