I know nothing about radio strains, but here's two that I would like to pass on to someone who could enjoy them. The clear one is mint, measures 3-3/8 inches and embossed on one end. Hard for me to read, but I do make out Pat ???. The green one looks as it has never been used. One end hole is not completely punched out, The glass body measures 2-5/8 inches and has two open bubbles. So, asking $30 plus $5 postage. PayPal friend/family please.