Bahtinov Focus Mask for Telescope - Celestron 130EQ  SLIDE ON, fits 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 USPS SHIPPING. 2 TO 3 DAY SHIPPING. Blue ,Other colors available.  If need a different size to fit your telescope message me as i may have a design or i can design one to fit your needs. Also available in white or black or other colors, comes in blue. Message for color. 6.25 inch inner diameter telescope fit.