The Elinchrom EL 24037 Flashtube F/S4000 and T4 are newer models of flashtubes that are easy-to-replace and long-lasting.In the previous models of the flash head, you have to remove many screws in the head and socket base, but in this newer version you just have to plug the flash tube in the socketUnder normal conditions, these flashtubes can produce up to ten thousand flashes when handled properly