Not permanent, but not a simple peel wont get them off either... Needs some heat.. here is a pic Here is a pic of when I used the suction cup.. Hard to use on the track because you bonk your head on it when you try and tuck That being said, I bought these for my new race bike... It works pretty well and doesn't have to stick to anything! http://www.jenningsgp.com/forums/viewtopic.php?f=3&t=19989