These are actual glass masks used in the process of making sophisticated ICs. Each mask is in a heavy plastic case. These masks cost a fortune to manufacture and they are fascinating to study the patterns under a magnifying glass or microscope. We had these before and they sold out very fast. We have a very limited quantity this time. Each mask is different. Sizes vary, but overall minimum size of the glass mask is at least 6" x 0.25" to 0.5" thick. Great for universities, educational use or just a unique art object. Quantity available = 5


   

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