Not sure when Cycolac ceased to be used, but my AMT 1970 Impala promo is definitely Cycolac (ABS) plastic. MPC and Johan may have been styrene in the end. Cycolac is a trade mark of SABIC which is owned (70%) by the Saudi government. They bought GE plastics which, too bad for the employees in Pittsfield, MA that are out of a job in 2016. I found that interesting. I like working on styrene models better anyway.