1.High quality carbon-steel is applied for the main body of the frame, all surface antirust treatment, frame made of carbon-steel, powder-coated 2.4 silent casters with self locking devices , flexible rotation without noise (various sizes available) 3.Guard rails providing free HI-LO controls with height adjustable freely, safe and reliable, easy operations 4.The bed head, end and guard rails are vertically partitioned to prevent infant from crossing over. 5.More nice-looking appearance with color collocations.