Ever get a back ache from playing pool? Have you ever considered that it could be your chalk? Until recently, pool chalk came in one perplexing design with four sides, which some believe creates undue stress on the lower back. Well, there is now an ergonomically correct, three-sided chalk that is sure to eliminate the potentially harmful effects associated with trying to use 3 fingers on a four-sided piece of chalk. Pyramid Chalk is made from the highest quality materials you're accustomed to and offers superior performance-it's just ERGONOMICALLY CORRECT! Try it.it just feels right!