... quality standard: ISO 9001:2008 2.Company:Flywheel Caster Manufacturing Ltd., established in 1981, which is ... -resistance.Now it already has become a professional caster company which integrates design, manufacture, assemble, inspection ... is from 15mm to 300mm, materials include rubber, TPR, PU, plastic, nylon, cast iron, pneumatic, phenolic ... American type thermoplastic rubber or pu caster wheels