office chair caster,chair caster,chair base caster,caster wheel chair caster, nylon center with PU edge,dia 60mm, office chair caster,chair caster,chair base caster,caster wheel1)chair caster, nylon ,dia 60mm, , BIFMA standard or NON.2)Without brakeModern style & exquisite quality3)Competitive price, fast delivery & good after-sales service chair caster