WARNING: CHOKING HAZARD -- Small parts. Not for children under 3 yrs. â—The core of the bronze bore brush is a single piece of wire that is looped on the end and a crimped coupler, so it will not scratch your bore, made for pistol/revolver length chambers. â—100% Cotton Mops are ultra absorbent. They hold and carry solvents, lubes and preservatives into your bore and chamber. Great for applying large quantities of modern copper solvents to fouled bores. â—Markings or numbers on the brushes to indicate caliber or size. â—Item weight: 1oz â—Package weight: 1.5oz â—Package Included: AR Style 5.56mm (.223 cal.) 2-Pack Chamber Brush, Bore Brush and Chamber Mop.