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ARP Pro Series front Tires for Formula-1 Retro Slot Car racing classes, .770 (19.56mm) dia, x .375 (9.53mm) Wide. Each wheel has two ball bearings installed for the least rolling resistance hubs are made of a polymer plastic for strength and weight reduction, Weight is only 4.6 grams for both wheels (2.3 grams per wheel including ball bearings). For 3/32" Axles, Hard Rubber tires on a polymer hub