Using these York dumbbells is easy. Just hold them firmly by the ergonomic handle and start your light - weight resistance or aerobic exercises at home or in the studio. When using, make sure your hands are dry to keep a good grip. Also, be careful not to drop them on hard floors from a high place to avoid damage. For maintenance, wipe the dumbbells with a clean, dry cloth after each use. Store them in a dry place to prevent the vinyl coating from getting damaged or the cast - iron from rusting. And remember, since it's an oversized item, it can't be delivered to rural addresses.