After you've purchased your first dumbbells, you will need to store them. A Hex Dumbbell Rack Set will be a top priority if you're looking for an easy storage solution for your home gym. These weights can be stored in either trees or racks. The dumbbell trees are triangular like a Christmas trees. They hold dumbbells horizontally at different heights. A dumbbell rack acts more like a shelf and holds the weights side-by-side at different heights.