This is a 4x6 inch bottle cap template. Use your favorite image editing software that allows you to place layers over other image and add text if you wish.
Recommended programs include:
Photoshop
Gimp
Photoscape
Make sure you add something UNDER the image layer itself or it will appear blank if you don't have the transparent checkerboard option selected.
Here's the link:
Free Bottle Cap Template 4x6 Download Link