Pilates resistance rings are small, portable pieces of equipment that can be used to add resistance to Pilates exercises. The rings are typically made of durable plastic or rubber and they have handles on each side to make them easy to grip. The resistance of the rings can be adjusted by moving the handles closer together or further apart. Pilates rings are often used in conjunction with other Pilates equipment such as mats and reformers. When used correctly, they can help to improve strength, flexibility and balance.