Review on Silicone Wall Protectors From Door Knobs - Self Adhesive Round Plate - Door Bumper Pads - Rubber Door Handle Bumper Guard For Door Knob by Melissa Perez

These things are good value and the silicone provides good noise dampening when the doorknob is hit. When they arrived I was unable to remove the lid to reveal the adhesive. However, the instructions indicate that once installed, they can be removed by heating with a hair dryer. So I heated the protective adhesive backing with a hair dryer for about 15 seconds, after which the protective adhesive backing was very easy to remove. I then installed the device onto a textured painted surface. It sticks very strongly to the surface.