The HOCKEY HAMMER is a training aid that is ILLEGAL for game play. The BUBBABALL is also a training aid that is ILLEGAL for game play. The BubbaBall is half white and half red. The distinctive coloring was selected to help make the BubbaBall easy to spot if it gets mixed in with legal balls. They're perfect training buddies and when purchased together you get the BubbaBall for more than 50% off.