Orion full aperature glass solar filter. Made to fit the SkyQuest XT 6 and SkyView Pro 6. The inside diameter is about 7 1/8". Less than 2 years old. I used it half a dozen times. Have original box and instructions. I paid over $130 including shipping and handling. Selling for $85 USD shipped CONUS and Canada. Paypal preferred. Will also accept money order. Help me finance my new telescope!