You can practice with the Dead Zero Putting Disk on any surface on any green at any time and get instant visual feedback while you practice. Keep it in your bag or keep it handy at home or in your office. Practice on any area of the green and challenge yourself with different slopes and speeds. Although designed for improving your confidence and making more putts of ten feet or less, the Dead Zero Putting Disk can also be used for long-range lag putting or green-side chipping.
To see more visit http://deadzeroputting.com
Disclaimer: I was in no way compensated for this review and this is solely my own opinion which may differ from yours.