That Purple Stuff Bowling Ball Cleaner is designed to restore the tack back to your bowling ball like it was brand new. It's approved for use during competition by the USBC. Tired of leaving that flat 10 pin? This cleaner will bring back the tackiness your ball had when it was new. You'll get the reaction you need to stop leaving corner pins. Best of all, it's approved for use ANYTIME by the USBC. This is for a 4 ounce bottle.