Dudley 12" Thunder Heat ZN Hycon ASA Composite Slowpitch Softball (Dozen) Dudley's proprietary HYCON Softball Core, which plays the same in cold weather as it does in hot weather, shows that Dudley is "Softball Serious™" and committed to product quality and high performance. Cover: Composite Size: 12" COR: .52 Compression: 300 lbs. Approved for ASA play Sold in dozens