Environmental Material: Carefully selected plastic material, high density and wear resistance. Adjustable: Adjustable size from 39-52cm is suitable for many flowerpot. With wheels can be glide out as your way. Durable: Strong enough to bear plant pots, no pressure, excellent quality. 360 Rotatable Wheels: Wear-resistant shock absorption double wheels, do not hurt the floor, easy to fix and move. Application: Perfect for plants pot, fish tank, portable washing machine, dryer, refrigerator, cabinet and air conditioner. Specification: Material: Plastic Color: Gray Diameter: 39-52cm/15.35-20.47 inch Height: 11cm/4.33 inch Suitable for Pot Diameter: 30-52cm/11.81-20.47 inch Package Includes: 1 Piece Movable Flower Pot Tray Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-3mm differences due to manual measurement.