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About once a year we cut out (via waterjet) 72 of them (36pr) from a sheet of T6 aluminum. I have about 6pr. left, we sell them as 'racer spacers' as they're not polished or insanely beautiful or anything but work like a champ. I've been using them for about six years now and we sell them much cheaper than the "BIG" boys...for future reference, just a side hobby to supplement my racing habit.