Cast alloy platform w/ reinforcements to prevent breakage. Combination of molded & replaceable pins for dialing in just the right amount of traction.

Specs:
Lightweight, strong alloy bodies
Compact 101mm square platforms
Screw-in tapered steel traction pins
Fewer traction pins to reduce weight
Heat-treated & oxide-coated chromoly spindles (9/16 only)
Precision ball bearings
Recessed dust shields
Weight:21.0oz (595 g)