The Karma is a predictable slightly over stable mid-range driver. This disc can be thrown low and hard for precision shots and is great in the woods. The Karma has a slightly blunt nose and bead which prevents it from tracking right and which helps greatly with side arm throws.
The Sure-Grip™ or "S"-Series, is a matted material and is a high end version of the "DX" or "D" plastic of from other companies. This type of polymer offers a firm, solid feel with a grippy surface and great performance in the rain or extreme heat. The "S" plastic allows the disc to break in slowly without changing its flight characteristics after just a few hits.