The ball is a hard leather-seamed spheroid, using a circumference of 9 inches (23 cm). The ball incorporates a "seam": 6 rows of stitches attaching the leather-based shell in the ball to your string and cork inside. The seam on a brand new ball is prominent and aids the bowler https://jaredtaiov.madmouseblog.com/16027612/match44-id-an-overview