It's rubber and damn they smell like that part! Take/leave the box outside and open it there. Like my wheel chocks, I suspect these washers will need to sit outside for a few months before they completely stop smelling in the room. They are made of HART rubber, just like the sport bushings. That's reassuring. They seem to do a good job of keeping pinched seams in shape. I'm considering drilling a hole or two in each pad to insert magnets so they can stick to the pressure welds across my bushings, not just balance them. I use these jacks because my stands aren't shaped for pinch welds and my car doesn't have flat spots on the jack points.
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