TriActive USA’s DDIP assumes usage of American standard size tubing, namely 3 “*3” square tubing x 11ga, 3 “*2″ rectangular tubing x 11ga, 2″ Round Tube 11ga, 1 -1/4^ prime prime OD round tubing x 11ga, ¼” hot rolled flat bar, and 11ga carbon steel sheet metal. TriActive USA Fitness Equipment does not include any of the following: exposed cables, hydraulics or plastic seating.