These are pre-cut strips that you attach to your racquet frame for power and a heavier swingweight. Each strip adds 3.62 grams (0.13 ounces) to the racquet weight. Each pack contains six strips, giving you the ability to add up to nearly 22 grams to the weight of your racquet.   WARNING: This product contains lead a chemical known to the state of California to cause cancer and birth defects (or other reproductive harm). Recommend you use gloves and wash hands after handling.