It's a black, silicone type case. Textured for a good grip. VERY easy to get on and off without feeling like it's going to tear... makes the device fit my larger hands better... I got it for $10 on Amazon a few months ago, but I think they are going for up to $15 now..
I bought a Blackberry official silicone case today because it was only $20 and because I had one for my Bold 9000 and it was awesome. I don't like this one as much. It's way too slippery compared to my old 9000 case, which was quite "sticky" and had a lot of friction - ideal if you worry about the phone slipping out of your hand. I guess some people prefer slippery because it slides into pockets easier, but I don't. Also the old 9000 case seemed to be way thicker.
I'm thinking of maybe giving it a little once over with some fine grade sandpaper, see if that helps build a little friction.