I attended the Eastern Outdoor and Sportsman Show in Harrisburg, Pa. a few weeks ago, and while looking at the Freak calls at the Primos booth I noticed they really had them roughed up, and they sounded great. I asked what they used, and they told me the Slick Stick (by Primos of course). I bought one of these and conditioned my glass call and also the original Freak call that I have, and they sound really good. The Slick Stick has a diamond cutter side, a sanding stone, a port to stick your strikers in to rough them up, and it holds your box call chalk and 2 more conditioning pads inside. It's a really neat tool and cost somewhere aroung $10.00. The guy at the booth said he uses the diamond cutter side first on a glass call and then goes over it with the stone. Try it, you'll like it.