The high quality construction provides exceptional stability, and flatness to 0.05 cm on a surface of 50 cm x 62 cm. Steel pins in peg holes around the perimeter are for the rubber bands to launch puck. Includes bumper wire assembly, leveling feet, Tee air fitting and hose, large and small pucks, hook and loop collars, and springs. Requires external air supply (#EA-20), which will run one table.