The finished product will be made of rubberized plastic for a non-slip grip and for added flexibility beyond the 69mm size limit mentioned above.
If you'd like two MilliMounts, select the $20 or $25 reward and simply double your pledge amount. If you'd like three, select the $20 or $25 reward and triple your pledge.... you get the idea :)
We originally 3D-printed our prototypes through www.Ponoko.com and created silicon molds. Later we bought our own 3D printer right here on Kickstarter (www.printrbot.com).
Don't see the answer to your question? Ask the project creator directly.