The SWINGRAIL Baseball & Softball Swing Trainer is a portable and lightweight training aid designed for beginner baseball players. This set includes an adjustable arm band and an impact-resistant rail, both made of durable nylon and plastic materials. The trainer is suitable for indoor and outdoor use, and is weather resistant for added versatility. Perfect for teens looking to improve their batting skills, this trainer is a valuable addition to any baseball training routine. Made in the United States by SWINGRAIL, this unit offers a convenient and effective way to enhance your swing technique.