Deck rails. At first I had 2 on and kept eating shit over and over, it was so slick. I had no idea how well they worked all these years but they were to slick for me. At the advice of a couple of slap pals I tried the toe side rail thing and I can confirm it is not a gimmick. I have never done a boardslide on a curb in my life and I was sliding them for days but taking off the one on the heel side. It slides but gives you enough friction to have control. It was one of those curb barriers without the sidewalk, just dirt. But my wheels were just smashing through the dirt it was sick.