I spied this awesome Halloween (or festival) mask on the Make: website. Wintercroft sells all kinds of mask templates (the above is the Dragon Mask V1) and instructions that are immediately available as PDF files after your purchase. All you have to do is print the templates out on paper, adhere them to the cardstock, cut them out, match the numbers up and tape them together. The instructions come with an internal headband that may be adjusted to ensure a snug fit. The masks generally run about $6.95 USD but are processed in GBP (British pounds). Head on over to the Wintercroft website to view all their templates.
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