Pro-Shot MP410 Bore Mop 410 Gauge Shotgun Firearm 5/16-27 Thread Cotton 1.75″ Long Cotton Bristles

Wool with brass core. These bore mops are 100% cotton and have a brass core. They are made of the highest quality construction possible. Mops can be used for quick cleaning and are especially excellent when using oil for bore lubrication because they create foaming action that helps in the lubrication process.