Tetra Gun Cleaning rods

What are these coated with? Carbon? Teflon? Just picked up one for my .22 rifles at Camp Perry for the great price of $15.95 as I have seen these go for double.

"...hit your enemy in the belly, and kick him when he is down, and boil his prisoners in oil- if you take any- and torture his women and children. Then people will keep clear of you..." -Admiral of the Fleet Lord Fisher, speaking at the Hague Peace Conf