Roboto Font

We bundle Paper with the latest iteration of Roboto Google has released. It comes with 5 different font weights you can use: 100, 300, 400, 700, 900.
Here is an image from Google's Roboto Specimen document displaying the different font weights.

Font Weight Classes

font-weight-lighter	paper
font-weight-light	paper
font-weight-normal	paper
font-weight-bold	paper
font-weight-bolder	paper