4mm ortho circle t Japan bought on astromart a few months ago but I only used it once. It's in very nice shape, one end cap, stored in plastic bag and non-original box since purchase. I'm selling because I have old eyes and bi-focals and try as I might, I don't think I'll be able to use it. $35 includes priorityy mail. Can do paypal [no cost to you], personal check, etc. Thanks for looking. clear skies.