The Stack System is a weighted golf swing trainer designed by TheStack specifically for swing practice. It is suitable for adult golfers looking to improve their swing speed through indoor or outdoor training sessions. The yellow and black trainer features a unique design that allows for easy customization to fit specific practice needs. The weight-equipped stack system provides resistance and feedback to help golfers refine their swing mechanics and build muscle memory for improved performance on the course. Comes with only two weights on shaft as shown.