The rigid, helix-shaped rubber core keeps the cleaning surface pressed against the bore, engaging the rifling for an aggressive clean. The caliber is specific molded rubberized core for a 360 degree cleaning.The braided Nomex® surface can withstand up to 700° heat, which enables the ability to clean at the range or in the field while the barrel is still hot. The Nomex® fibers act as both a brush to loosen and a patch to capture fouling particlesEquipped with 8-32 threaded ends to fit all Otis cleaning components, so you can attach a bore brush to get an even more thorough clean. The easy-feed design enables for a quicker cleaning from Breech-to-Muzzle® It's fast, effective and ultra-portable.