Handcrafted in our factory using food grade acrylic/Perspex the top and bottom are both 5mm thick and the hollow centre tube is 44mm inside diameter so you can fill it with small petals, crystals, jelly beans or anything else you wish. The height on this product is 8" high but we can do other custom sizes should you wish to contact us. The edges are all polished and clear and can be used many times, Acrylic is not suitable for dishwashers and should be cleaned using only warm soapy water. Many other displays in our store and we can also manufacture to your own design.