50
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"),pkg/10
12mm (0.47"),pkg/10
15mm (0.59"),pkg/10
20mm (0.79"),pkg/10
See this link for Properties and chemical composition of Mica Grade V1