The Proof Positive 20 Caliber Nylon Bore Brush provides effective cleaning for 20 caliber firearms with durable nylon bristles that won't damage your barrel.20 Caliber Nylon Bore Brush 3-PackNylon bristles for safe effective cleaningDesigned specifically for 20 caliber firearmsPack of 3 brushes for extended useSKU: BTNR-20-003Essential for proper firearm maintenance these nylon bore brushes effectively remove fouling and debris while protecting your barrel's rifling and finish.