11-Degree Seat Wedge11 Degree Seat Wedge A high quality 11 degree seat wedge. Corrects poor seat design or provides a forward tilt to level out poor seat angles. Available with or without coccyx cut out. Standard 11 Degree Seat Wedge Tilts the pelvis to the optimum 11 degree keeping the spine in its natural position. Significantly decreases pain in the lower back and legs. Size: 360 x 360 x 100mm. 11 Degree Seat Wedge with Coccyx Cut Out Tilts the pelvis to the optimum