Anti-scuff protectors, typically made of fiber sheets, are commonly used on cricket bats to protect them from wear and tear during play. These sheets can help prevent scratches, scuffs, and damage to the surface of the bat. While they provide a protective layer, it is unlikely that an anti-scuff sheet alone would significantly increase the sting of the bat. The "sting" or vibration that occurs when a cricket ball strikes the bat is primarily influenced by the bats construction, material, and the quality of the shot played. Factors such as the size of the sweet spot, the thickness of the bats edges, and the quality of the willow used in making the bat play a more significant role in determining the level of sting felt. If you find that your bat feels stiffer or has more vibration after applying an anti-scuff sheet, it could be due to several reasons. One possibility is that the added weight and rigidity of the sheet may slightly alter the bats balance, which can affect its feel during play. Another factor to consider is the quality and thickness of the anti-scuff sheet itself. Thicker or stiffer sheets may affect the bats performance more than thinner, more flexible sheets. Its worth noting that cricket bats naturally undergo a "knocking-in" process, which involves using the bat to hit softer balls or using a special mallet to compress the fibers of the willow, making the bat more durable and reducing the chance of cracking. This process can also help reduce the sting or vibration felt when striking the ball.