The Advanced Ortho ACL Hinged Knee Brace in size Medium is designed for stabilization and healing of the knee. Made of nylon, neoprene, and metal materials, this black brace is FDA approved and features adjustable settings for a personalized fit. The unisex design is suitable for adults and comes in a single unit quantity. The model number is 855-L, making it a reliable choice for providing support and comfort to the knee.