The Chief OS is an over-stable Chief giving it a more accurate hyzer line. It’s ideal for drives and approaches that need to fade hard and sit down at the end of the shot. The low profile shape and overstable design is also ideal for forehand drives and approaches.
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.
Note: All of these discs feature the XXL Sun King hotstamp.