These replace the larger rear rollers that feed the paper on the majority of Remington (non noiseless) portable typewriters up to the 40s. Fits nice and snug on your original bare metal rollers. You will have to strip yours if there is still rubber material on them and these slide over and are very tight. 

3D printed with synthetic rubber-like material. Does not include the metal inserts.

I have been restoring vintage typewriters for over 7 years and the biggest pain is dealing with the old rubber rollers deteriorating. Decided to try 3D printing replacements for myself and they work great! Very sturdy and durable, great grip, and no scuff marks on the paper.