Hoppe's airgun cleaning kit 3-piece steel rod with looped handle (rod has 5-44 male threads) 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.