Pilates Rings, also known as Magic Circles, are commonly used in Pilates to add intensity to floor exercises. The ring's resistance speeds up toning by targeting specific muscles. Especially useful in problem areas like the inner and outer thighs, upper arms, the chest and even the pelvic muscles. The Pro Edition Pilates Isotoner from Align-Pilates features a double handle design and quality sprung steel rings. The 12" ring is designed for users under 5ft, 5" or 165cm Also available in 14" Feature: Material: Sprung Steel SPECIFICATION: Brand Fitness Mad Usage Home Use, Commercial Use Condition Brand New Warranty 12 Month Warranty