Durable, tight woven, 100% Fiberglass- easy to install Natural thermal heat wrap. One roll will wrap one medium header. We hand picked this material for it's heat characteristics and most importantly the flexibility of this material makes wrapping headers much easier. Reduces under hood temperatures increases horsepower protects other engine components protects against burns 2" Wide x 1/16" thick 50 Feet long Each roll comes with 5 FREE, 14" long stainless steel zip ties!