Frame: Heavy-duty 3" round 11 gauge tubular steel. Powder Coat Finish: Polyester Electrostatic Resin powder coat offers a durable, low maintenance finish. Parts: Hardware consists of 1/2" anti-rust coated bolts. The pivot points have 2" precision sealed steel ball bearings, to ensure a smooth and relaxing motion. Seats: The contoured, 1 1/8" thick, imported hardwood seats support the body for ultimate comfort. Optional Canopy: The optional canopies are constructed of .4mm thick polyester or 100% solution-dyed acrylic canvas. There are ten optional canopies: Round Forest Green, Round Camel, Round Sesame Linen, Round Navy Blue, Round Burgundy, Square Forest Green, Square Camel, Square Sesame Linen, Square Navy Blue, and Square Burgundy. Product is patent pending. Health In Motion LLC. reserves the right to alter product specifications at any time.