caster wheel material:pu caster wheel diameter:100-200mm caster wheel width:45mm caster wheel surface:Zn frame:rigid type,swivel type,swivel with ... brake type,it is more stable,flexible.surface: the caster wheel's surface is Painted by Zn,resist oi,rust ... ,corrosion.material: poluurethane caster wheels,it has large loading capacity,protect the ground, can ...