The innovative Top Popper allows you to easily open cans of soda or beer. The Top Popper simply slips on the index or middle finger between first and second knuckles. To open, just slide the hook on top of top popper toward you to effortlessly open cans without broken nails. Available in XS - Large. One of the two additional images show the diameter of the rings. The other has a size chart which you can print, cut out, and use to measure for your size.