We are offering flash lamp.Stx series xenon lamps description of model number: stx-xxx-yyy-zzz-w or stx-xxx-yyy-zzz-dxl stx xe lamp xxx outside diameter (in general, the thickness of the glass tube is 1mm) yyy arc length zzz over all length w -- wire end style (no w means base end style) dxl diameter and length of base if the end is base