Size: 12" Worth's 12" Classic M softballs have blue stitching and are approved for play in the USSSA Added to these softballs is the C-LOK adhesive and moisture barrier and then the SYCO composite leather cover for more durability. Added to these softballs is the C-LOK adhesive and moisture barrier and then the SYCO composite leather cover for more durability Sold by the dozen Worth's 12" Classic M softballs have blue stitching and are approved for play in the USSSA.