4 Ounce USA Steer Leather Sides are running 16 to 18 square feet each.  Regular temper, from a military boot maker.  Chromium tanned, finished with some wax and oils to help it resist water/sweat; nice haircell print on the surface (that means it has been embossed with a very fine texture).  Nice, clean sides.  Many have brands on them.  This is Black Boot; these sides are $75 each, 48-state USA shipping included.