The Res-Q-Splint Plus works with a single chamber to keep the polystyrene from being divided improperly. It uses different valve positions in all spots to make it all easy to use. It works in many traction systems and can be worn even when a CAT scan or X-ray is required. This kit features an aluminum vacuum pump that can be manually operated plus a nylon bag with storage compartments for all three splints and the pump. The three splits that come in this include 735 x 640 mm, 1100 x 695 mm and 1300 x 720 mm sizes for people of all sizes and different kinds of injury treatment needs.