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When searching for a reliable and durable solution for medium and heavy duty projects, consider Service Casterâs Series 30 top plate thermoplastic rubber donut tread on polyolefin core casters.Service Caster is unsurpassed in quality, reliability, and excellent customer service. Listing is for a set of four (4) Service Caster Series #30 casters with a 5" diameter, 2" wide thermoplastic rubber donut tread on polyolefin core wheels.