Diabolo hubs, also known as diabolo axles, are the central shafts that connect the two cups of a diabolo toy. They are typically made of metal or plastic and are designed to spin smoothly and evenly, allowing the diabolo to be manipulated and performed with. If you are looking for replacement diabolo hubs for Taibolos, you may be able to find them at a store that specializes in juggling equipment or online through a retailer that sells diabolo accessories. Some things to consider when shopping for replacement diabolo hubs include the material they are made of, their size and shape, and whether they are compatible with your specific model of Taibolo diabolo.