The eXasis concept car, produced by Rinspeed for Bayer MaterialScience is made of a clear plastic material called Makrolon ^®.

Rinspeed and Bayer MaterialScience introduced the car at the Geneva Motor Show on 8 March 2007. It features an aluminum frame with a clear high-tech plastic body and floor. It is powered by a 150-hp 750 cc 2-cylinder engine, which is entirely driven by bioethanol. This see-through automobile has a power-to-weight ratio that can match a Porsche and can cruise up to speeds of 130 miles an hour.