The ProLine is back. This all-aluminum, USA made plate is the one that everyone else has tried to copy for the last twenty years. High rebound urethane cushions.The king pin is made of 7000 series aluminum.  It is lighter and twice as strong as standard mild steel pins.  Due to their special angle geometry it sees less stress than other skates which makes it less prone to breaking. Adjustment of the truck assembly is by a micrometer.  You first loosen the tapered locking screw and by rotating the micrometer nut one mark at a time, either compress or relax the cushions by .001 inch. The axle in the truck is the hardest, toughest, and truest of all axles held to the tightest of standards.The truck pivot pin is nextled in a porous bronze, oiled for life, bearing.Their base plate is made from 7000 Series Aircraft Aluminum which makes it very strong but extremely light. Mounting slots to adjust the location of the skate on the boot for optimum performance.The truck geometry is the most precise and quickest turning skate ever.