Check the listing for details. Bahtinov Mask for Samyang SY14M-C 14mm ,0.8 mm pattern larger diffraction. Condition: New. Listed at 11.99 USD. Aperture =71mm Inner Diameter =89mm Height =25mm Bahtinov Focus Mask for Telescope - Samyang 14mm SLIDE ON fit like cap. 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. grey 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 on most if not all of my listings, most items will be shipping that is paid by buyer. slowly listings with free shipping will be changed over to shipping that is charged to buyer. Costs of shipping supplies are up, and costs of shipping are going up. So most of the listings will be changed over time. But that will also mean lower prices on items. some will lower 1 to 5 dollars, depending on price. So customer still get good deals but also helps me for a fair deal to help pay shipping. Shipping charges and shipping supplies killed my business last year. To keep this business afloat I needed to start making some changes. hope my customers understand. Thank you all! ... Matt of Spencer-3D