The Black Knight Magnum Corona.
Can't find any current affiliate links. May be sold out.
Not to be confused with the newer Black Knight Magnum Corona 6. Still no word on what happened to Coronas #2-5. Guessing some product guys at Black Knight drank them.
Anyhow, Ryan Cuskelly was playing with this at the 2013 World Championships:
Photo by Steve Cubbins