Hi-Impact Yellow Birch of the highest bat standards and from second growth forests being regenerated each year. The wood bat with the Best Impact Performance and the Longest Durability. In Drop 5 Models for Maximum Bat Speed. Every billet is sorted and graded on structural elements then accurately weighed to ensure excellent model consistency. The Birch Crossover is strengthened with fiberglass biaxial sleeving applied with our Special Rock Resin Epoxy. Comes with a 90 Day Limited Warranty against manufacturers defect.