i have had invisagrip on my 6"x24" and my 12 1/2" square rulers for about 5 years now. it was a gift and i figured i should give it a try. i messed up at first getting it on, but once i got past that, it's been fine, it's lasted all these years, and it does help with stability. and it's totally see through, you really don't know it's there once it's in place.