The Berg disc from Kastaplast (http://www.kastaplast.se/) was PDGA Approved as of 3-27-2015.

"Berg is a slow, stable putter designed for precise short drives and approaches, as well as fearless putts. It can be trusted not to hover too far past the basket even on windy days. Berg is Swedish for mountain. Steady as a rock!






More... (http://www.pdga.com/announcements/stopem-cold-berg)