These 20cm road disks are a must for the serious racer or drifter. These away different corners to be set up to allow for fine tuning your car. The orange color disks are easy to see - even at night - and because of their shape, they stay in place if you run them over. If a car runs them over - no problem - they return to their original shape. Made from tough plastic, these are built to last. I would pick up a few packs and make a course.