+1 acrylic stems, if you can use them. I know some find them too hard against their teeth, but if you can use them, their durability is the right material for smoking outdoors. Otherwise, you will put up with some oxidation and may just have to replace some stems. Acrylic stems with smaller pipes are less felt on teeth, and you can get full-length smokes with smaller pipes with flake/plug/coin/rope blends. They just burn slower, mostly.