In Rewards, all eight rulers are labeled by unique ID number, e.g. #3 corresponds to Calculus ruler, #5 corresponds to Chemistry K-12 ruler.
Remember the rulers you like to have, by the moment when the campaign is succeeded, we will send out emails surveys asking for shipping address, and you can notify us the ruler ID you wish to have.
YES, the surface was actually coated with a layer of real GOLD to make the rulers reflective, attractive and durable. Get one in your hands so you will immediately know how shiny it is.
Don't see the answer to your question? Ask the project creator directly.