ProStroke is a unique putting aid which attaches to the end of your putter and is used as a guide to keep the wrists quiet during the stroke. It is very simple to use and very effective. Using only a tee peg and a length of Velcro, the ProStroke attaches easily to the top of your putter for a more stable wrist every time. Website: ProStroke.co.uk Instagram: @ProStrokePutting Email: Info@ProStroke.co.uk YouTube: YouTube.com/ProStrokePutting For installation instructions if you have a counterbalance/counterweight putter, please visit - https://www.youtube.com/watch?v=E2jDWSJuEdQ