Bahtinov Focus Mask for Telescope - SW 80/400  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 free USPS SHIPPING. 2 TO 3 DAY SHIPPING. SILK BLACK . Other colors and types available just ask. Comes in black but other colors available, and all items are customizable to change size or add things.