Draper 65520 100mm Dia. Swivel Bolt Fixing Polyurethane Wheel - S....

Diameter - A measurement across a circle passing through the middle

rubber - Synthetic rubber is any artificial elastomer, usually a polymer, and is used as a substitute for natural rubber.

rubber - Natural rubber is an elastomer derived from the latex containing sap of some plants.

100mm - the equivilent of 10cm

Polyurethane - A man made chemical combining polymers and urethane mainly used for paints.

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