Body-Solid Pro-Style Commercial AB Board Adjustable ab board for improving core stability and tightening up midsection Sturdy 2-by-2-inch mainframe covered with thick, double-stitched DuraFirm padding 12 adjustable positions make it easy to design diverse, efficient workout routines Oversized 8-inch foam rollers fit comfortably beneath knees and ankles Appropriate for home and commercial use; 10-year frame warranty