These bushings are conical (both top and bottom) for the ultimate carving experience. Basically conical bushings get progressively stiffer as the truck turns meaning that they have unparalleled turning response without giving up the spring and feedback that you need to keep on track.
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Q:Can i use these on a normal skateboard truck where the length of the kingpin where the bushings go is 1 and 3/8 of an inch?
A:probably not they are designed for pairs longboard trucks so it most likely won't fit