All aluminum with 2 rare earth magnets imbedded to hold in place. Fits 5th gen Camaro, focus, Challenger, and many other cars with at least 3 inch opening for pinch weld jack point. Does not fit vert Camaro, email info@zl1addons.com for that pad. Note: The Jack pad is made to lift the car from bottom of pinch weld as the stock jack would do. YES! THEY ARE MADE TO WORK WITH CARS WITH GROUND EFFECTS