Features: The Baseball Training Sock features an sticky strap that securely fits most arm sizes. Designed to promote proper throwing mechanics during practice, this Baseball Throw Training Sock provides quickly feedbacks after each throw, helping you improve your speed with usage. Great for individual training, this Softball Pitching Trainer is Easy and quick to put on or take off, convenient to carry. Baseball Pitching Training Sleeve Used to simulate pitcher training movements and help players practice pitching skills. This baseball training tool is easy to carry around and suitable for both adults and teenagers, making it a option for practice. Specifications: Component: Polyester Size: about 49x16cm/19.29x6.3inch Package Includes: 1pc Baseball Throw Training Sock Training Tool note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.