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Casters 2 Inch Spherical Nylon Sofa Furniture Caster 50Mm Dia Swivel Castor
High quality: The spherical roller is made of steel galvanized bracket and nylon wheel, which is smooth, flexible and wear-resistant. Application: These are chair ball casters, mainly used for wooden chairs, even small sofas, benches, sofa chairs,...
https://www.bizrate.co.uk/homehardware/casters-2-inch-spherical-nylon-oid40288204105.html