This compact mobile storage cabinet includes six shallow Gratnell clear storage trays [included] on runners that make storage, organization and identification of items a snap. The rugged trays are easily removed and replaced by children after playtime or classroom use. Mounted on casters for handy mobility. Need a different storage configuration? Check out our other Column Storage Cabinets: WB7002 Double Column Cabinet, WB7003 Triple Column Cabinet, or WB7004 Quad Column Cabinet [each sold separately].