I purchased two of these rings to add to our costumes for a 5k superhero run. While the rings fit my large 6' tall husband, it wouldn't even stay on my medium frame thumb. While I knew the rings were not adjustable, they did come with an opening at the bottom which didn't allow me to wear it on a chain around my neck.

Also, the soldering on the light board is very poor, leaving one of our rings to work just fine, while the other broke after turning it on twice.

I know there aren't a lot of options for adult size Green Lantern rings, but if you're not a large person and/or you don't really care if the ring turns on, this is not the ring for you.