answers: Vectran or nylon
context: factors. Sheaves were traditionally fabricated of cast iron, but steel and nylon sheaves are now common. Blocks are either upright, when mounted atop a support structure, or under-hung, when mounted to the underside of a support structure. The side plates of blocks preferably fully cover the profile of (fully enclose) the sheaves to lend the block greater stability and limit the sheave's (and crew's) potential for damage from foreign objects. Nevertheless, blocks are available with exposed sheaves. A Loft block is an overhead block that supports a single lift line. A loft block supports and redirects a lift line from </s> These shoes are designed for a variety of activities and sports, including running, athletics, basketball, badminton, football, American Football, baseball and tennis. The athletics shoes were debuted at the 2007 World Championships at Osaka, while the rest made their first appearance at the 2008 Summer Olympics, in Beijing, China, though all are now available for consumer purchase. Nike Flywire Nike Flywire is a thread, composed of Vectran or nylon, and developed by Nike, used in the upper of a shoe. The goal of Flywire is to minimize weight and maximize support. Shoes containing Flywire became available for consumer purchase in </s> manner and with the same type of materials used to tie traditional artificial flies. However instead of a hook being clamped in a vise, tube flies are tied using purpose built tube fly vises or adapters. The small diameter tubing is threaded on a tapered needle until secure allowing the addition of materials without the tube slipping or spinning. The ends of plastic tubes are flared with a heat source either before or after the addition of materials to prevent thread from coming off the end of the tube. Plastic or metal cones are sometimes added at the head of
question: more recent versions of flywire are made of a thread comprised of what material