Check the listing for details. 4" Sapphire / Gallium Nitride Wafer 1980s Silicon Wafer Rare CPU Chip. Listed at 200.00 USD. This Wafer is Very Unique. It is Blue, which i haven't seen on a Wafer Before. I initially thought this wafer was SAPPHIRE, but when looking into it I found that Blue wafers can also be "Gallium Nitride," so it is possible that is what this Wafer is.
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