Pro Ink Dot Certified Split Stock Yellow Birch of the highest baseball bat standards and from second-growth forests being regenerated each year. All of our Hi-Impact birch billets are vacuum dried and controlled to best performing moisture content ratios. Bats are Double Boned for max hardness, Hand Sanded for the best balance and Triple Dipped. Only the finest from sawmills who specialize in birch. All models come with a 30-Day warranty.