The 4th and 5th metacarpal splint is made of 80% Foam and 5% Nylon material with a bendable aluminum plate and strong magic tape, durable and breathable. HIGH QUALITY MATERIALThe pinky finger splint is made of 80% Foam and 5% Nylon material with bendable aluminum plate and strong magic tape, durable and breathable HELP FINGERS RECOVERY EFFECTIVELYThis pinky finger splint is suitable for arthritis, carpal tunnel, repetitive stress injury, sprains and strains, metacarpal bone, finger break, fractured finger, sprained knuckles, post-operative care and finger pain relief ERGONOMIC DESIGNThis pinky finger splint has built in two sturdy aluminum splint that can be removed and bent to the needed angle. Adjustable straps on the wrist and fingers allow to control compression, customize fit, and maximize stability WIDELY USEDThe pinky finger splint can keeps fingers straight and supported comfortably all day or night. It also reduces injury and fatigue during exercise, allowing patients to resume normal daily activities while recovering SIZE REFERENCE Please choose the right size before purchasing. S/M: Measure from the top of the ring finger to the base of the wrist less than 6.5(16.5cm); L/XL: Measure from the top of the ring finger to the base of the wrist greater than 6.5(16.5cm). Fits for men and women