The Stroke Groover is an incredibly simple and effective way to immediately improve your pool game. Developed by Master Instructor Tom Simpson to allow players to feel when they drop their elbow during their stroke, this tool is extremely helpful for training your muscles to stroke the right way. The Stroke Groover is used and endorsed by pool instructors all over the country because it really works.Features:Detailed instructions, pictures and a link to a training video are includedOne size fits mostSmall enough to fit in pocket or case