Seems when my hubby put our loop lock into the shed during the summer , instead of the basement, mice got in the bag, and not sure why as it was super hot this year and locked inside a shed, never would i have thought they'd gnaw on it, but this was perfect. I took one patch and cut into 3 pieces, easy easy, peel off the back and you cannot tell anything happened to it. EXCELLENT Product every loop lock owner needs.