If I remember correctly this was an early attempt to simulate tortoise shell using the wonder that is known as acrylic. Slap a gold letter on and you’re good to go! They are 1-1/2″ x 2-1/4″ and there is a narrow variety of letters.
16 key chains in all and one is blank with glue residue having lost it’s letter.
I don’t think they have been used but not in pristine condition most likely from being tossed around in a bag for a number of years and/or set out on display. Some have light surface scratches but not surprising if you’ve worked with this material.
Got an idea to rework them? Leave comments in the “review” area.