Features: 100% Compatible with original manufacturer equipment. USA Based brand; includes a full warranty and customer service. (See "NOTES" below) Material: Cotton and Aluminium 17-20 Caliber is 5-40 Threaded 22-50 Caliber is 8-32 Threaded There are Markings or Numbers on the gun jags to indicate caliber or size. SKU# 1883 NOTES: Brushes are considered to be consumable items, warranty is only for manufacturing defects and does not cover normal wear from use. The thread size is 8-32 Please make sure you have the correct size rods/cables before purchasing. This listing is for the Mob Brush only. All other items pictured are for reference purposes only.