The Zhangkong Training Plates are used for training purposes and whilst they cannot be used in competitive events they are still extremely precise in weight and dimension. Accurate weight & dimensions Perfect for competitive training Colour coded Largest Diameter 450mm Zhangkong are specialists in competition and Olympic style weightlifting equipment. All of their products are approved by the International Weightlifting Federation (IWF), meaning they meet certain specifications required for use in Olympic competition.Zhangkong equipment was used in the Beijing Olympic Games in 2008 and is built with precision and accuracy in mind. The competition style equipment is approved by the International Weightlifting Federation (IWF) for use in Olympic lifting. The training equipment, whilst not suitable for competition, is also extremely accurate in weight and dimension. The discs are all colour coded as per IWF specification. SPECIFICATION: Brand Zhangkong Usage Home Use, Commercial Use Condition Brand New Warranty 1 year warranty