I really like the clear plastic dots. They grip well, stay put and you can see through them. I found the sand paper dots didn't make enough of a difference. I have used Invsi- grip but it is more expensive if you have a lot of rulers. I also prefer the rulers with the little ledge at the end (O'Lipfa is one brand) that actually grips your cutting board. They are my favourites because they decrease slipping even without adding the plastic dots.