The Trius truspin arm propels clay targets by the throwing ring not the outer edge for a faster spin greater distance and less breakage. Oil-impregnated bushings in the aluminum throwing arm ensure years of trouble-free shooting. With this quality trap you may throw regulation singles as well as piggyback doubles. The structural rigidity and durability of the steel construction ensure years of service. Operation by a Single Person: One person can shoot and launch clays at the same time thanks to the unique foot pedal launching technology. Step on the pedal to tighten the arm and release the clay targets all at once.