Bodymax Olympic Rubber Radial Weight Plates are designed to make lifting and loading weights onto bars easier. The rubber coating provides a more aesthetic finish than plain or painted cast iron finishes. The rubber coating also protects against rust and reduces noise of discs "clanking" against each other - rubber also protects floor coverings. This product is categorised as an "Olympic" format weight lifting product - each end of an Olympic bar is 50mm (2 inches) diameter, and olympic weights have a hole in the centre of each disc of just over 50mm (2 inches) diameter that enable it to be used on "Olympic" bars. In the UK, the other main format of weight lifting bar and weights is categorised as "Standard" - standard bars are 25.4mm (1 inch) thick, and "Standard" weights have a hole in the centre of each disc of just over 25.4mm (1 inch) thick enabling them to be used on "Standard" bars. Be careful to order the correct gauge of bar or weights. Kit consists: 1 x 7' 20kg chromed and knurled olympic barbell, 2 x 20kg rubber radial discs, 2 x 15kg rubber radial discs, 2 x 10kg rubber radial discs, 4 x 5kg rubber radial discs, 4 x 2.5kg rubber radial discs, 1 x pair olympic spring collars All disc sizes are available in black, additionally larger disc sizes are available in colour coded options: 10kg (green), 15kg (yellow), 20kg (blue) and 25kg (red).