Discraft says this about the Focus: Discraft Stability Rating: D-Line 0.5
The 2009 Ace Race proto is now the versatile Focus. This bullet-nosed brute fills a gap in Discraft's putter line up, being our only 0.5 putter. Focus will cut moderate winds on long approaches, and delivers pinpoint accuracy all the way to the chains.
About D-Line Plastic
Superior grip, great for beginners or pros, very economical, different amounts of wear yield desirable flight differences.