Space Exploration Pin-Back Button collection includes (1) 1.75 John Glenn button, (2) 1.75" Apollo 11 buttons w/ribbons, (3) 1.75" Apollo 11 buttons, (1) 3" Apollo 11 button, (1) 3.5" Apollo 11 button, (1) 3.5" Gemini 4 button, (1) 3.5" Young/Grissom button and (1) 3" Challenger button.