This product has a multiple uses and works well. There is a rough stone and slightly smooter abrasive surface for conditioning your friction calls. With the handle, you get apply some pressure and get an even roughing up of your friction call.
The Slick Stick is compact. You can easily carry it in your vest. I start with the rough stone side and rough up my call. Next I use the smoother side to even it out. The Slick Stick has places to store a piece of chalk and additional sand paper.
This is one of the better abrasion tools I have used.