You are bidding on a group of 3 vintage Western Electric type 313C radio/audio cold cathode thyratron tubes.  All three test good on my military TV-7D/U tester.  These glow a bright red.  They have very dark red lacquer over the envelopes to prevent light from changing their firing point, which is 185 volts.   They should be great for your project.  Shipping weight is 8 ounces.  Please see my other auctions for more interesting radio and audio items, and tubes.