The boxers fracture is a break in the 4th or 5th metacarpal bone in the hand. It gets its name because the injury is common in inexperienced boxers. UNIVERSAL - The Metacarpal Boxer Splint was designed to be used on either right or left hand comfortably. This hand splint is uniquely designed in just 2 sizes, please see the size chart for additional sizing information. Easy to apply using just 2 medical grade velcro straps. ALUMINUM STAY - This Finger Splint was designed with a sturdy built in stay that can be removed and bent to the needed angle. This allows you to control the perfect immobilization for all breaks. Also helps for cleaning the brace. Use our boxer splint while awake or sleeping. BREATHABLE MATERIAL - This Broken finger hand splint was designed with comfortable breathable material, the inner material is perforated, allowing your wrist to breath and not sweat up. MULTI PURPOSE - The Boxer Splint is great for the standard break of the 4th or 5th metacarpal. This can be because of a break, sprain, fracture, whether its the finger or knuckle. Great for post-operative care and even regular pain relief from sore fingers or knuckles. NO RISK - Here at we stand behind all our products allowing you the customer to purchase with confidence.