This is a must if you have a set up system like Yeah Racing Universal Set up System for 1:10 On Road #YT-0110BK.
Totally flat and it has the right surface finish to allow you setup system bearings to move easily to give you accurate readings.
Setup systems won´t work good at all on glass and some plastics, and the surface has to be totally flat and smooth.
You may want to buy also the HUDY (#108211) Plastic Set up Board Decal For 1/10.
Hudy products are very good, a little expensive maybe