From the manufacturer's website:
Give your wrist some relief with the Mueller Black Wrist Support.
This wraparound support provides adjustable compression to weak or injured wrists. Non-restricting design helps maintain full range of movement. Helps relieve pain and keep your wrist flexible. Elastic loop for easy application and adjustment. Lightweight for comfortable all-day wear.
One size fits most ranging from 6-12 inches (15-30 cm).
Warning: This product contains natural rubber latex which may cause allergic reactions. This is an elastic product and care should be taken not to restrict blood flow. Recommended for daytime wear only.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.