due to its internal magnetic shield, the milgauss is thicker than the submariner, but the same width and weighs 157 grams. the milgauss is available only in 904l polished stainless steel, an alloy that is extremely resistant to scratches and corrosion. aside from its resistance to magnetic fields, the milgauss' most unusual feature is its orange lightning-bolt second hand, a unique feature in the rolex lineup that was originally introduced with the 6541 milgauss model.