NAVIGATION
Stainless Steel disc, 102mm (4.0in) dia x 12.7mm (0.5in) thick, Type 304
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Brass spheres, alloy 260, 6.35mm (0.25in) dia
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Bronze gauze, alloy 220, 40 mesh woven from 0.25mm (0.01in) in dia wire
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Nickel Copper foil, alloy 400, 1.98mm (0.078in) thick
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Aluminum foil, alloy 6061, 2.0mm (0.08in) thick
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Brass foil, alloy 260, 0.51mm (0.02in) thick
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