One item of note is the "universal shell", a type of field gun shell developed by Krupp of Germany in the early 1900s. This shell could function as either a shrapnel shell or high explosive projectile. The shell had a modified fuze, and, instead of resin as the packing between the shrapnel balls, TNT was used. When a timed fuze was set the shell functioned as a shrapnel round, ejecting the balls and igniting (not detonating) the TNT, giving a visible puff of black smoke. When allowed to impact, the TNT filling would detonate, becoming a high-explosive shell with a very large amount of low-velocity fragmentation and a milder blast. Due to its complexity it was dropped in favour of a simple high-explosive shell.