The 'H' Alignment Aid is a training aid that will help you set up your putter on your intended line every time. Very easy to use: Set up The Perfect Putter accordingly to the speed and line you want to hole the putt with and attach the 'H' to the front of the device. Remove The Perfect Putter and start practicing yourself. This training aid is going to give you feedback on every single putt you hit. It comes with a synthetic leather bag.