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These wheels are from the Colson Performa range, which has long been a favourite of combat robot builders.
The non-marking thermoplastic elastomer tread is permanently bonded to a ribbed polyolefin wheel core which is fitted with a 19.05mm (¾in.) aluminium hub with a 6.35mm (¼in.) key-way. Each wheel comes with two steel discs for holding the wheel in place on the end of a 19.05mm (¾in.) shaft.