Size Name:35 Pack At almost 5/16 inch thick (.30 inch) these bumpers provide protection to your surface and the height allows airflow under the item. The height also prevents damage from liquid spills on the surface. The black bumper is a stable foot under small appliances, electronics, computers, laptops, power supplies, mantel clocks, stereo components, televisions, monitors, charging docking stations and more. Bumper feet can hold items in place while preventing scratching and reducing vibration. Self adhesive rubber feet adhere to many surfaces to prevent scratching and to provide a non-slip grip. The top side with the adhesive is about 3/4 inch square with a strong adhesive to stick to the item, but it tapers down to about a 3/8 inch square on the foot. The taper gives it a trim look while providing strong adhesion and stability. Bumper pads are easy to install. The surface you are applying the bumper to should be smooth, non-porous, clean, dry and free of debris, oils and solvents. We have included one alcohol prep pad for you to clean the surface before applying the bumper pad. After wiping the surface with the included alcohol pad, grasp the bumper on the sides without touching the strong adhesive. Press bumper firmly into place on the surface of your item. Bumper cannot be repositioned without ruining the adhesive. For maximum adhesion allow 24 hours before exposing heavy force or weight on the bumpers.