Before anything else i would like to give credit to CookieMaster for being the creator of the original design of the Jason Voorhes mask, you can find the original mod here:

http://moddingofisaac.com/mod/978/jasonvoorhesmod

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So yeah, this is a rework of the Jason mask, it originally was meant as a personal edit because i felt the original was a bit too cute looking, so i added a different look on the front and the sides to give a more menacing expression, i even made a broken mask design to choose from.

-----Installing------

Just unzip the files, choose the mask version and copy the resources folder in the game files

Windows: C:/Program Files (x86)/Steam/SteamApps/common/The Binding of Isaac Rebirth

Mac:~/Library/Application Support/Steam/SteamApps/common/the binding of isaac/The Binding Of Isaac.app/Content

Hope you enjoy it!