Schwalbe believes that hand making a tubular tire is an art in itself. So, because production differs distinctly from the manufacture of regular bicycle tires, they are exclusively manufactured in a new Schwalbe factory. For each, individual "hand made tubular" a lot of careful craftsmanship is required, so only the most skilled people are employed to construct each tire &, by h&, stitch & glue together each part. Triple Star Compound Schwalbes best & most sophisticated triple compound. Perfectly adapted to the specific purpose. The Pace Star compound has a easy rolling base layer, fast centre (medium soft) & grippy shoulders (medium soft).