Hoppe's Viper Boresnake Rifle Bore Cleaner (.338, .340 Caliber) Washable and reusable quickest 3 step bore shine Brass weight on the pull cord Cone shaped bore guide on the leading end The world's quickest 3-step bore shine 50% more brush cleaning power than the original BoreSnake Cone shaped bore guide for quicker alignment Designated lubrication zone on the handle; brass weight on the pull cord is stamped with size Patented one-piece design; machine washable