our products meet EN71 and ASTM F963,we have got ISO9000 certificate,.we have warranty on all parts as follow: 1 5years warranty on our heavy duty steel frames. 2 1year warranty on all moving parts. 3 all spare parts available for replacements. 4 durable power coating. 5 air tires with long life durabity & new racing tread. 6 each wheel includes 2 industrial ball bearings for long term smooth running. if you interested in our products,please contact us as soon as possible. The color of product can be changed by orders. Packing: 1pc/one-direction-flip double corrugat