The asymmetrical cross section, flat sides & end taper combine to offer a variety of placement options in widening cracks where cams may walk out. Made from T-6 aluminium with swaged galvanised steel cables they are both lightweight & durable. These may not be the latest & most technologically advanced piece of protection, but when you are faced with a flared crack which just wont take a cam, or you are looking for an absolutely bomber piece of gear, youll be glad you racked up these bad boys.