Check the listing for details. 37mm Thread DSLR Camera Lense Bahtinov Mask CAP (VERSION THREE MODEL). Condition: New. Listed at 11.99 USD. HIGH BAHTINOV FACTOR VERSION 3 . MORE BAHTINOV LINES WITH THIN LINED MASK FOR HIGH BAHTINOV FACTOR! VERSION 3 IS THE 3RD VERSION OF THIS MASK. NEW DESIGN! CHECK OUT PICTURES AND COMPARE TO VERSION 1 AND 2 MASKS. MADE FROM HIGH DEMAND FROM CUSTOMERS. 37mm Version THREE of original DSLR Bahtinov masks models. Updated mask with better focusing, no text plain front with a more loose non binding pressure spring that now fits better and not binding to mask. 37mm Thread DSLR Camera Lense Bahtinov Focus Mask VERSION 3 High Bahtinov Factor . Condition is "New". Shipped with USPS First Class. Free shipping through USPS 2 to 3 days when buying inside the United States. Made with black plastic on 3d printers. Made and designed by Spencer-3D. If need a size thats not posted on my sells list just message me and I will make the size you need no problem. I can design or make changes on just about anything. If need a Bahtinov mask or part ti fit your telescope or camera message me. I do more then just Bahtinov masks, I make and sell alot of different things. I always have shipped out WITHIN 48 hours of purchase unless its an custom made part or its in a weekend or holiday. Usually %90 of items get made and shipped within 24 hours of purchase, so I pride myself on getting your project or products to you as soon as possible . Thanks....Matt