The use of the batarang has been in a state of constant development since its early appearances. In 1946, Batman and Robin developed a "batarang gun", and then a lighter "batarang pistol" in 1947. A 1957 story called "The 100 Batarangs of Batman!" ("Detective Comics" #244, June 1957) detailed the magnetic batarang, the seeing-eye batarang, the flash-bulb batarang, the bomb batarang, the rope batarang, the police whistle batarang and the mysterious Batarang X, among others. That issue also included an "origin story" for the batarang, which was given to Batman by an Australian circus performer named Lee Collins.