Skillbuildersä Strap Wedge 20 x 22 x 4 11¨ Scales Physician Beam 18 X 16 * The MSHQ MENM375 18 X 16 * The contoured design combined with the simple operation of the ISOFLO© Memory Control unit offers provides a new level of postural control and stability that has never been achieved in an air cushion * The contoured design positions the pelvis back in the wheelchair and centers the individual comfortably in the middle of cushion * The ISOFLO Memory Control unit locks air into each of the four compartments providing stability by minimizing side to side and front to back motion * Adjustable to individual * Spacious 28 quart wastebin standard 5 wide velcro positioning straps provide support when positioning the child * Without the removable straps the deluxe wedge functions just like the standard Skillbuilders© wedge *