The toy line included four astronaut action figure characters sharing a common body molded of a rubber-like material called "Plastizol" (which was also used in the Mattel "Thing Maker" toy line and "Mister Twister" line of fishing bait). The body was molded over a wire armature, with a separately attached head and a removable space helmet based on early NASA helmets. The wire frame often suffered from metal fatigue, breaking at the elbow, knee, and hip joints, giving the toy a limited life span as a result. The space suit paint adhered poorly to the body molding and often peeled off to reveal the black molding beneath. Each character body was painted in a different color and had a separately modeled head. Matt Mason had a dark brown crew cut and a white space suit, Sgt. Storm had blond hair and a red suit; civilian astronaut Doug Davis had a yellow suit and brown hair; Lt. Jeff Long was African-American, with a blue suit (almost two decades before Guion Bluford became the first American black man to orbit the Earth). Mason figures produced in 1966 are identified by blue straps on the space-suit. These straps were painted black in subsequent production years.