Highest quality grade V1 mica, 0.21mm (0.0085”) thick. Interleaved, in packages of 10. Can be mounted on AFM/STM discs. Available in four diameters: 10mm (0.39") 12mm (0.47") 15mm (0.59") 20mm (0.79")
See Properties and chemical composition of Mica Grade V1 Technical Note