Bathroom key tags

These are tags I built for the bathrooms of an elementary school. Basically, kids wear them or hold on to them so people know they have permission to use the bathroom. I built them sturdy as kids tend to break things, but they're also light enough so that they are not pulling on their necks or arms. Can be held with any type of rope or chain to be easily used. A little too large for a lanyard. Could reduce the thickness for that.