【Product Description】 Thank you for viewing! This is a silicon epitaxial wafer manufactured by Toshiba Ceramics. Although it is an old product, it has been stored unused. How about it for collections, research, or processing materials? 【Product Details】 Model Number: OS-EK7501A Manufacturer: TOSHIBA CERAMICS CO., LTD Lot No.: S1L2256 Type: N/N+ Diameter: 100.0 ± 0.5mm (approx. 4 inches) Quantity: 25 sheets (full case) Condition: Unused product stored for a long time ・One side has a mirror-like finish ・The other side has a matte finish with less gloss Please refrain from purchasing if you are looking for a product in perfect, new condition. If you wish to purchase individual sheets, please comment and we will consider it. If you have any questions, please feel free to contact us! Thank you. Silicon wafer / silicon wafer / silicon wafer / Si wafer / semiconductor wafer / semiconductor wafer / semiconductor substrate / epitaxial wafer / epitaxial wafer / epi wafer / epi wafer / Toshiba Ceramics