 The early production of the Wrist-Rocket slingshot was a joint effort between Saunders Archery Co., who came up with the trademark and developed the automated forming machinery, and Mark Ellenburg who came up with the basic design.A few years later Mark Ellenburg split away forming his own company called Tru-mark Manufacturing Company.Today Saunders Archery is still a major innovator in the slingshot industry with its line of flatband slingshots which use locking clips for band attachment and  tuning.