MaximalPower Cotton Cleaning Patches Patch Material: 100% COTTON Patch Size: 1-1/2" (1.50" or 38.5mm) Patch Shape: Square Cleans the most popular caliber/bore sizes: 300 AAC Blackout, .308 Winchester, 7.6251mm NATO, 7.6239mm, .30-06 Springfield, .30-30 Winchester, etc. Can clean any bore from 0.240"/6mm to 0.310"/7.9mm. Soft yet strong 100% cotton patches are perfect for removing carbon and other debris