Rubber Band Pulley Collection

While working on my Halbach PM generator (https://www.thingiverse.com/thing:2374343) i came to a point whhre i would need to eventually test it and the easiest way to do that is with the newspaper rubber bands i get from work. I know there are several pulley sets out there but i had time to kill so i designed a set that goes from 37mm to 125mm it also includes some multi-speed pulley sets. these pulles are designed to be used on a M10 bolt, because that is what i am using in the center of my PM