Metal and plastic，the trays are plastic and the pillars are iron 【Sturdy & Stable】The 3-tier mobile storage cart is made of high-quality steel frame , which is strong and durable, waterproof and wear-resistant . Each basket load capacity can reach up to 33 lbs. 【Saving Space】 3-Tier cart provide enough storage space for your daily life, optimize the space utilization, and make the messy room tidy. Cart Dimension : 33.5*14.5*21.25 inch . 【Movable & Convenient 】Utility rolling cart is equipped with 4 heavy duty and lockable casters with 360°rotation . It is easy to move or stay stable as needed. 【Easy Installation】3 Tier utility rolling cart comes with assembly tools , it only takes 5-10 mins to set it up. 【Classic Design】The classic color and design makes this storage cart better match the decoration style of your home or office.