Kastaplast K1 Tuff Putter Golf Disc (Individually Listed)TUFF Is Here ? The Putter That Won't Back Down The time has come for Kastaplast to add another disc to the line up, a putter ? TUFF. The putter is one of the most used discs in the bag, and the feel in the hand is equally important as the flight. Getting to know your putter is one of the most important keys to master disc golf, and small variations in shape or depth can make a big difference when deciding whether it will make the bag or not. TUFF