Arnold knives are made of high carbon steel. Some are stainless with outside, professional tempering, however most are non-stainless and therefore custom tempered in the home shop.
Handles feature brass or bronze hilt and butt-plate / pommel silver-soldered and then epoxy glued. Most handles are hollow-tang. Exotic hardwoods include the Dalbergia species (cocobolo, rosewood, tulipwood), desert ironwood, lignum vitae, wedge, zebra wood, bootee, oceanspray and yew wood. Some have antler or goat-horn included in the handles. Some have colored resin-impregnated maple handle stock.
The blades are nitric-acid (HNO3) etched through wax or asphaltum varnish.
Sheaths are hand sewn of 8-9 oz tanned leather.