I have an inventory of ems (electron miscroscopy copper pinhole) apertures for sale. I have not set up my website yet, but please send me a pm if you need any number of these very fine pinholes. The cost is $1.00 US each, plus $5 shipping and handling per order.

I have the following sizes in stock:
200 micron (.2 mm)
300 micron (.3 mm)
400 micron (.4 mm)
500 micron (.5 mm)

I plan to keep these in stock, and I am willing to order 150 micron or 600 micron as well, if there is any interest.

Thanks.

Earl Johnson