Check the listing for details. 80 ED 600 SW 117 Aperture Bahtinov Focus Mask. Condition: New. Listed at 12.49 USD. Bahtinov Focus Mask for Telescope - Universal 80ED 117 Aperture Bahtinov 80 slot size, 600 Bahtinov Factor.SLIDE ON cap fit. Condition is New. Shipped with USPS First Class. Software Designed and tested. Works great with these and similar models. 3d printed and designed by Spencer 3d. As always fast free USPS SHIPPING. 2 TO 3 DAY SHIPPING. Dark BLACK color, available also in black or any other color just let me know. If need in different color let me know or if need one to fit your telescope let me know I may already have a design, if not i can design to fit yours. May fit others same size or other brands.SHIPPING CHARGES ARE CHANGING FOR ALL ITEMS I SELL ON EBAY. MANY ITEMS THAT ARE FREE SHIPPING WILL BE CHANGING SLOWLY TO SHIPPING THAT IS CHARGED TO THE BUYER. SHIPPING SUPPLY COSTS AND SHIPPING CHARGES ARE HURTING THE BUSINESS. BUT WITH SHIPPING CHANGES HAPPENING THIS WILL MAKE FOR LOWER PRICES ON THE ITEMS THEMSELVES.