Blue Diamond Chalk 2 piece box is used by top professional and amateur players the world over created from a Longoni secret formula for over 30 years. Blue Diamond Chalk has just now been discovered by players in the USA. Blue Diamond chalk is like a magnetic for cue tips, even on hard to hold chalk tips like Phenolic, and will cure most all your miscue problems allowing you to get more English on the cue ball. Sold as 2 pc. Box