Frank B. from Damascus, MD United States
If you can't tell which is the insulated wheel - you can use a continuity tester to determine which wheel is insulated. Touch one lead to the axle the other to a wheel. If the testor lights thats the "hot wheel".
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Reboxx HO 3311035 Wheelsets
January 22, 2013
Of the 48 wheelsets (12 wheelsets per package) I purchased, 6 wheelsets are extremely difficult to distinguish the insulators from the noninsulated sections, because of discolorations at each end of the axle. Magnification and excellent light definitely needed.