From the Tamiya website:
Give your MA chassis machine a stylish, pure look and more toughness with these white ABS-polycarbonate MA chassis parts. Both chassis and A parts are molded in white. Please note that as reinforced material may cause tight screw fit.
Compatible Chassis: MA Chassis cars
All contents © 2017 HobbyLink Japan Ltd.
Kurohakama-cho 162-1, Sano, Tochigi 327-0813 JAPAN