-Wellgo manufactures pedals for alot of companies, chances are your have a pair under your feet right now. The MG-4's have magnesium bodies, replaceable pins, loose ball bearings and a chromoly spindle. Thanks to lightweight magnesium they weigh a mere 15ozs. per pair. Available in black only, in 9/16". If you do pedal grinds we suggest you look at another pair of pedals.