Key fobs & key flags
Metal key fobs are essentially a small coin with a split metal ring and swivel attachment. They are two sided and about 1.25" diameter and slightly thinner than coins. They have a metal loop at the top for attachment.
Rubber key fobs are PVC rubber patches. They can come in a variety of shapes and sizes.
Embroidered Key flags come in various sizes. The most common are REMOVE BEFORE FLIGHT flag shaped and about 1.1" tall x 5" long. They are embroidered on both sides with text and can have a small logo.