Summary

Its a simple solution for 1.9"crawler tires which many are too soft at the sidewalls like the Duratrax Deep Woods. Enhances the grip and the sidehilling capacity.
Printed in 95A TPE .Top and bottom two layers
You will need two of them for each wheel.
Second file is for Hairbun donuts in 1.55 ,1.9 and 2.2" ...work very well and are easy to install.