Discraft ESP Challenger - 2 3 0 2 Stable - The Challenger is an amazing overstable putter, and very popular with advanced players. It can get around trouble for those long hyzer putts and is overstable enough to take a good amount of snap on approaches.
ESP Plastics - Released in 2006. Incredible Grip, Durability and long life, ESP
plastics were made to have all the best parts of X and Z plastics all in one.
Pictures are for reference only.