MLB Prime bats are popular among MLB Players around the league. This line is made of Veneer Ash wood, and only the best quality wood on the market is used in the MLB Prime Bats. The techniques of Amish Craftsmanship is used as well, square billets and hand sawing, are combined with the advanced vacuum drying chambers to form the foundation for the hardest bat you can swing. With 360 Degree Compression there are no soft spots on this line. The new compression process makes a harder, more durable bat and makes bone rubbing a thing of the past. MLB Prime bats are 9H rated - the highest rating available on the 21-level universal hardness scale