I used old bicycle inner tubes cut to whatever size I want. They are free (or virtually free from bike repair shops), can be cut to whatever length, are easily replaceable, do not change the shape of the grip like Hogue but still provide ample stickiness. And by the way, people have been doing this for a long time. Before any manufactured slip on grips. Just goes to show that you can take a cheap and simple idea, market it right and make some serious coin on something that used to be free.