The Sentinel MF is unique among midrange discs. Its rare combination of speed and fade make it perfect for the following situations: low ceiling fairway drives, against-the-wind approaches, skip/fade up-shots, and “reverse S” approaches.  Sirius plastic is the ultimate combination of superior grip and die-hard durability. The Sirius plastic is what you want if you desire the best of both worlds. This plastic will last, and it will feel good along the way.