Cube vs Ball: The cube has sharp corners for a more intense effect. Sharp pores create high pressure without scraping off the skin. Similar to traditional callus building methods but without the excess damage allowing for a faster build up of skin. This thick skin can help with skin toughness and grip via better friction. As well as reduce sweating of the palms and fingers. Long duration squeezing also promotes more blood flow to the hands stimulating recovery, growth, and grip endurance. The ball can also soak up the balsam trio for a slow release. Note: Pore size varies ball to ball.