Hi! The top row of pins (tree, honeycomb, Lady Rainicorn, and the skeletons) are an example of bottle pins with the design on the inside of the cap. The pin is fastened on the back (on beer/soda logo) of the cap. The bottom row of pins (gear, red and white text, and corona) are an example of pins with the design on the outside of the cap. The pin is fastened on the inside of the bottle cap. As long as I am not cutting a design by hand (which I am often not), I can add the design to either style pin - that includes the gear pins!