Using these rubber bumper feet is a breeze. Just peel off the backing and stick them onto the bottom of your electronic device or circuit board. Make sure the surface is clean and dry before applying to ensure a good stick. When it comes to removal, you can gently pull them off without leaving much residue. As for maintenance, keep them away from sharp objects to avoid damage. If they get dirty, you can wipe them with a soft, dry cloth. And remember, the style may vary, but all of them are about 8mm in diameter and 4mm tall.