There are 3 sizes of circular hole available:
.125" (1/8") - Suitable for use with many common tagging guns, fine string or twine, very thin ribbon, etc
.25" (1/4") - Suitable for use with fine to medium weight string or twine, thin to medium width ribbon, etc
.3625" (3/8") - Suitable for use with thicker string or twine, thick ribbon, thin rope, etc
While ribbon can be used with round holes, it can end up being folded/curled and not lay flat. If a flat ribbon is desired, or for applications where a round hole is not suitable, "badge" style holes are available in the following sizes/configurations:
.625" wide by .125" Tall, Centre Top
.625" wide by .125" Tall, Centre Top and Bottom
1.25" wide by .25" Tall, Centre Top
1.25" wide by .25" Tall, Centre Top and Bottom
These options will work for all wide, flat loop materials and flat wire product hangers for in-store display. The options with top and bottom holes allow for the loop material to go through both holes. For example, if a ribbon is wrapped around an item like a belt.