The Iqon Replacement Skate Axles and Screws are made to replace the axles on Iqon frames, but many can be used across other frame brands depending on the specs. 
 
Iqon AG60 Two-Piece 8mm (Item # 20120):
IQON AG60 Axle 8mm Chrome Steel – Precision-engineered 8mm chrome steel axle for the IQON AG60 aggressive inline frame.
 
Iqon One-Piece 8mm L34mm Torx (Item#61006):
8mm two-piece M7 thread axles . They fit all decode frames so if you are looking to get a subtle rocker on your inner or outer wheels these would be a great solution instead of getting slightly differently sized wheels.