Rounded Corners on tubing do not have sharp edges making it more gentle and safe for cattle. Rounded corners don't pull hair when cattle rub against bars. This special type of tubing offers the strength of square tubing with the safety of rounded corners. Sullivan's Aluminum Cadillac Chute is the only one in the industry to have this special extruded radius tubing for aluminum chutes! | Sullivan Supply Inc 8' Aluminum Chute | Size 8'