1.good quality 2.reasonable price 3.easy to assembly 4.light 5.durable Caster is important component of Wei Top flow pipe system,which commonly used in worktables,carts,racks.there is cast iron rubber wheel,super artificial rubber wheel,PP wheel,phenolicaldehyde wheel,with elastic,low noise when move it.Advantages:1.slide2.duable3.adjustable4.light white nylon caster wheel