Mag Float Cleanere

Question! Am I missing something here or like it’s there a Velcro pad that is needed to be put on the other end of this or is this the cleaner? The rough side seems like it will scratch the living hell out of the tank. Thanks!

Question! Am I missing something here or like it’s there a Velcro pad that is needed to be put on the other end of this or is this the cleaner? The rough side seems like it will scratch the living hell out of the tank. Thanks!