The Reko disc from Kastaplast was PDGA Approved as of 12-15-2015.

"Get your Reko for those straight putts and approaches, or give it a little hyzer on drives and watch it turn over gently. This disc has all the qualities of a true go-to putter. Reko has a comfortable, rounded profile and a smooth bead which fits most hands. Easy to grip and easy to throw, Reko features a strengthened shoulder which adds a little extra durability versus a typical putter. Reko is Swedish for good, reliable or decent. The world needs more Reko. Flight specs: 3/3/0/1" - by Kastaplast