BoreSmith Triangle Patches, Cal 17 thru 20, Premium Gun Cleaning Patches Qty 1000 in a poly bag, and patch fabric is USA-made 100% cotton flannel The patented notched triangular design does not get stuck in bore, and it reduces rod flexing Its long 1.3-inch side reaches farther down a jag, and they are used with long jags or our Jag Brush It makes more contact with a bore wall, and it makes your gun Cleaner Faster using less patches It out performs square and round patches in every way