Akro Agate Tightline U V Corkscrew Marble. This one measures just under 11/16” at about .680” and is in mint minus condition.The color is a nearly neon yellow with a green tint.There is an intense reaction to ultraviolet light.This is Uranium glass that is crystal clear.We always combine shipping and invoices.We have a perfect seller rating and we aim to please. Thank you.