The PLAYM8 multi-bases have a hole in the top to allow multi-poles to be inserted and they are made from hollow impact resistant, unbreakable plastic with a rubber bung in the base. They can be filled with sand or water and they come in a set of 6 per pack (Multi-Clips & Multi-Post not included - these must be bought separately). FEATURES Hole in the top to allow multi-poles to be inserted. Unbreakable plastic with the rubber bung in a base. Can be filled with sand or gravel for extra stability. Each pack consists of: 1 x Red, Yellow, Blue, Green, Purple and Orange. 22cm diameter bases with 3cm diameter hole. Come in a set of 6 per pack.