Our largest xenon strobe tube is 9.6" long x 0.4" diameter. It produces brilliant flashes of blinding white light. Operates from 300VDC up to 500VDC (cathode to anode voltage) and 4kV trigger voltage. Made from Heimann Borosilicate glass and rated for 1 million flashes. These are custom made for us and are factory fresh (not surplus). You will be amazed at the blinding white output of this tube! Sold in a package of 2.