NAVIGATION
Platinum Iridium foil, 0.05mm (0.002in) thick, 99.9% (metals basis excluding precious metals)
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Platinum Iridium foil, 0.1mm (0.004in) thick, 99.9% (metals basis)
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Platinum Rhodium foil, 0.025mm (0.001in) thick, 99.9% (metals basis)
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Copper Beryllium foil, alloy C172, 0.13mm (0.005in) thick
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Copper Beryllium foil, alloy C17200, 0.15mm (0.006in) thick
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Copper Beryllium foil, alloy C17200, 0.25mm (0.01in) thick
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