A hard steel insert is locked into the body of the rubber weight plate via reinforcement keys.
These plates are much thinner than other bulky economy bumpers this is achieved by introducing a concealed steel core to the rubber plate allowing more weight to be loaded on the bar.
International IWF colour coded
Strict weight tolerance
450mm diameter (IWF standard)
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Plate thicknesses are:
5kg - 25mm
10kg - 40mm
20kg - 65mm