Hoppe"s airgun cleaning kit 3-piece steel rod with looped handle 2.25-oz. Hoppe"s 9 lubricating oil Brass jag .17-cal brass brush* Cleaning patches Gun care guide *The brush is .17 caliber. It will still work on your .177-caliber airguns.• While airguns don"t require constant cleaning like firearms, there are times when they need to be cleaned to achieve maximum accuracy. Hoppe"s has a reputation for making high-quality gun oil and cleaning accessories.