CNT245 (OTTO) Multi-walled carbon nanotubes, 95% (OD: 40-60 nm, Length: 1-2 um) - used for cathode ray lighting elements in electron field specifically because MWCNTs are possibly the greatest known electron field-emitter, highly because of their increased length-to-diameter ratios. They are also used in wafer processing fabrication in RFI shielding materials.