The lightweight ball is ideal for warming up quick hands, while the standard-weight ball is the exact weight of a hockey puck. Finally the heavy steel ball specifically targets strength development and training, ensuring that the puck is glued to your stick in a game situation. Included in the set is: • Lightweight speed ball: 50 grams • Standard-weight ball: 115 grams • Heavyweight steel training ball: 375 grams • Drawstring storage bag