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These precision 5mm diameter, 8 inch long PYREX NMR tubes are made from quality borosilicate glass for compatibility with ground joints, valves, and vacuum racks. They are designed for use on NMR spectrometers running from 60-100MHz. They have an O.D. of 4.97 + 0.000-0.013mm and an I.D. of 4.20 + 0.013-0.000mm. These NMR tubes can be used with the PYREX Microcell system (No. 9984) to avoid diluting valuable microsamples.