German Made Z574M Nixie Tubes. Digits are 13mm or 1/2" high. These tubes have a red tint, which can be easily removed with hot water if desired. Check the pictures below for a sample of one with the tint removed. Tubes are wire ended and can be directly soldered onto a board. The Z573m and Z574m are identicle, except that the '3m has a right hand decimal point where as the '4m has a left hand decimal point.

Datasheet Here