Arundel's top model, Mandible, is made with a foam core to add stiffness yet reduce weight. The grip is the strongest of all Arundel cages, with an emphasis on a tight fit to keep the bottles on the bike no matter what. Mandible cages have weathered the Grand Tours, the Spring Classics, Worlds, in fact all of it. This cage is truly durable and elegant. A bonus feature is the extra set of mounting holes that are 20 mm lower, giving you extra clearance from the top tube.