The STX Shift SC-TI Attack Lacrosse Shaft has two sharp spines running the length of the shaft which create a concave slot on the sides of the shaft. The side of the shaft that faces the front side of the head is more rounded. Basically it is designed to seat itself perfectly where the rounded part ends up on your fingers and your thumb fits right in the groove. It has a slightly sand blasted finish making the grip amazing without needing so much tape.