MATERIAL--This Plant Caddy is made of pine wood, Stainless steel wheel, which is corrosion resistant ,sturdy and not easy to wear. It can withstand the test of time and outdoor. EXTRA LARGE SIZE--16 Round the planter caddy, the height is 3.5inches,Please measure the diameter of the bottom of your flowerpot before you buy it. The plant stand is strong enough to hold up more than 500Lbs (226 kg). STABLE & STURDY--6 360 heavy duty Metal wheels can easy movement your heavy plants, large potted trees, big vases in any direction. Besides, 2 lockable caster wheels can keep your flower pot in place and prevent sliding.