This CT121S9 comes with Primary Green 9 three inch deep single depth trays. This storage rack is manufactured from 1in square steel tube with an epoxy powder coat paint finish frame. The top work surface is a sturdy dark gray wood laminate. The unique tray runner module allows for it to be fixed to the welded tray rack framework maintaining the units strength and structural integrity. Trays are manufactured from a high impact polystyrene or ABS. Both are super tough grades of plastic giving excellent strength and wear characteristics. Include 4in rubber casters.