I just got the answer from "the horse's mouth":
Damn good hook is very similar to Hook-it, and why it can't be used during competition. It does have a light amount of abrasive material in it to put a little surface back on the ball.
Thanks for your inquiry!
Thank you and best regards,
RaeMe Schnebelt
Marketing Coordinator
Consumer Products
Brunswick Bowling & Billiards
(231) 725-3376 Office
(920) 907-2702 Fax
raeme.schnebelt@brunbowl.com