These plant caddies are so functional and great for sitting your indoor or outdoor plants on. They come with 1.50" tall clear casters that can support 280 lbs / set of four. We make round caddies which you can see in our store but the demand for rectangular and square ones has been such that we have added this item to our store. The plate is of 1/2" clear acrylic so it blends in with the environment and has a minimalistic effect. Your plant is the center of attention, not the plant caddy! We have listed many of the common requested sizes but if you need a size that is not listed please call us for a quote. Thank you for shopping with us at PlasticMart.