The First Floss section removes foreign particles prior to scrubbing, the Bore Brush section (bronze bristles imbedded in cord) loosens hard deposits, and the Main Floss section finishes the cleaning job, providing 160 times more surface area than a patch. One or two pulls through the bore and you're done! Machine washable and comes in resealable clampack. Each brass weight is stamped for identification of caliber or gauge, and each size is a different color. Lubrication oil is not included.