These are two burnt Model Products Corporation model rocket motors. They are made of pasteboard and contain non-explosive propellant. They were placed in a small fire of newspapapers in 1970, evidently to prove that they would not explode. Each motor is used only once to power a model rocket. G. Harry Stine, a pioneer in the field of flying rocket models, donated them to NASM in 1973.
Gift of G. Harry Stine