ACCO BRANDS, INC.-SUPPORT,BACK,1/2BACK,BK. Halfback Back Support Chair Pad, 13w x 1-1/2d x 13-3/4h, Black. Spinal comfort and support through an anatomically molded plate covered in eggshell foam. Encourages correct posture. Elastic back straps criss-cross for easy adjusting and secure mounting. Washable stretch Lycra® cover. Back Support Type: Chair; Material(s): Eggshell Foam; Width: 13 in; Depth: 1 1/2 in.