CORTEX Gym Ring Pair FIG Spec with Markings 28mmGym Rings provide workouts beyond free weights or cable weights, with balance based body weight exercises that will work your smaller, stabilising muscles and core. Excellent for building strength and control. Our wooden Gym Rings are carefully crafted to provide a smooth finish, and offers a greater grip than plastic rings. These rings are built to the International Gymnastics Federation (FIG) specifications for competition gym rings so you know