Comes as is Meade 10 inch [O.D-270mm I.D-78mm] . If need size changes as some are different just let me know and I can make the proper changes.  Just buy this one that's posted for sell and I will make changes on software and send the one you need. If un sure it will fit check measurements, even if it dont fit I can change to fit your specifications on software, just let me know. comes in grey or black but any color available when requested. 

Bahtinov Focus Mask for Telescope - meade 10 Inch 270mm Bahtinov,  78 mm inner diameter. for  meade Cassegrain 10 inch Tri Bahtinov, new design from Spencer-3D . From Spencer 3D  SLIDE ON. 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 USPS SHIPPING. 2 TO 3 DAY SHIPPING. Comes in tan, grey, or black, but if want an particular color let me know ,. If want in a different color I can make in several other colors just message and ask me. New Design , Works great!

MY LISTINGS ARE SLOWLY GOING TO BE COVERTING INTO NO LONGER PROVIDING FREE SHIPPING. MOSTLY DUE TO COST OF MATERIALS AND SHIPPING GOING UP. AND HOW LOW MY 'ROI' HAS BEEN LAST YEAR AFTER DOING TAXES. THE FREE SHIPPING IS KELLING ME. BUT SENSE FREE SHIPPING WILL BE SLOWLY GOING AWAY I WILL BE LOWERING THE ACTUAL PRICE OF THE ITEMS SLIGHTLY TO0 HELP FOR CUSTOMERS TO STILL GET GOOD DEALS