Some home exercisers prefer Adjustable Dumbbells for their compactness and convenience, while Fixed-Weight Dumbbells have some distinct advantages: they are durable and will last virtually forever. Adjustable dumbbells may have plastic pieces or intricate internal components that can break, so check reviews and brand reputation. Fixed-weight dumbbells are easier to use; you can just pick up the dumbbell and get started. On the downside, you'll need to buy multiple sets of fixed-weight dumbbells in order to keep your muscles challenged, and that cost can add up quickly. Iron dumbbells are most common, but these weights can also be made from chrome or steel. For home use, Rubber Coated hex dumbbells, which are shaped like a hexagon to prevent rolling, are a good choice. These dumbbells are tough and durable, but they won't cause as much damage to your floors if you drop them.