30-1233 Size: 6" H x 8" W x 30" D Features: -Half rolls combine stability of a wedge with the positioning versatility of a roll.-Use velcro hook on flat bottom to anchor roll for additional security.-Provides stable base for knee flexion and extension. Dimensions: -2" H x 18" W x 4" D.-3" H x 18" W x 4" D.-4.5" H x 24" W x 6" D.-6" H x 30" W x 8" D.