Size 12' Coated Cover with 2 sided adhesive to produce longer lasting ball One Piece Softball Construction Polyurethane Center made from materials imported from the US Cover Optic Yellow TM Synthetic Leather Stitch Blue COR .40 Compression 325 lbs. In choosing Wilsonreg, coaches, trainers and players cite unmatched performance, feel and durability. Wilson Super Seam Technology TM helps players pitch and field with better control and accuracy. Wilson baseballs and softballs are the preferred choice of 40 collegiate conferences and half of the state high school associations nationwide. Wilson is also the Official Baseball and Softball of the Little League TM World Series.