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, ... caster wheels,it has large loading capacity,protect the ground, can used in vulcanized ground in factories. heavy duty PU round caster wheel