I originally got these for Bruzair my second Pit that plays disc, he is real tough on the disc. He is not real fast so I use these and throw into the wind, it gives him more time to get to the disc and it will fly into the wind better that the lighter disc.
I have started using these on very windy days with Karma also. Both dogs are hard on disc and these hold up better than any other disc. They are a great disc for toss and catch, they fly great into the wind and hover without moving backwards.
Another great product from Hero (Posted on 7/30/09)

I didn't think the dogs could see it at first, wrong they can see it even in low light late in the evening. Bruzair (my other pit) is harder on disc than Karma. They last and last, show hardly no bite marks, and he even chews as her comes back. He is a little slow so I throw these into the wind, it gives him more time to get there and thay fly great into the wind. At this point they are the disc of choice for Bruzair, he wants one of each style. (Posted on 7/24/09)