 Holes are drilled between the lips and as nostrils; the eyes each have a narrow slit, with three holes in a trefoil design, two round holes outside and a heart-shaped hole in the middle, underneath each eye to allow for a greater range of vision.These apparently were not enough, for a small and rudimentary notch was carved into each of the heart-shaped holes to increase the wearer's vision.The mask is approximately 2 millimetres thick, of which the silver, which is folded around both the edges and each hole to hold it to the iron, accounts for between .25 and .5 millimetres.