The list of approved bowling balls exists in www.bowl.com under ABC/WIBC Specifications and certifications

Download as PDF document:

www.bowl.com/downloads/pdf/approved_balllist.pdf

Download as Excel spreadsheet:

www.bowl.com/downloads/misc/approved_balllist.xls

	To access PDF files you need Adobe Acrobat Reader installed. If you do not have Adobe Acrobat Reader on your computer, you can download it below.
	Download Free Acrobat Reader

Source: http://www.wtba.ws/index.php?topic=statutes&sub=3