Replacement Axles for Burgtec Pedals. A) MK5 B-Rage Edition Steel Axles Replacement Axles for Burgtec Penthouse Flat MK5 B-Rage Edition Pedals. Made from Hardened En24T material8mm allen key Includes both left & right axles. B) MK5 Steel Axles Replacement Axles for Burgtec Penthouse Flat MK5 Pedals. Made from Hardened En24T material8mm allen key Includes both left & right axles. C) MK4 Composite Pedal Axles Replacement Axles for Burgtec Composite MK4 Pedals. Made from SCM415 CR-MO6mm allen key D) MK4 Boost Steel Axles For riders who like their pedals to sit further out. Boost axles sit a further 5mm off the crank arm for riders that like a wider stance on there bike. Includes both left & right axles. E) MK4 Titanium Axles Titanium axles for the Burgtec Penthouse Flat Mk4 Pedal. A must for the faster racers and pimpest riders. Made from Titanium Grade 5 material Includes both left & right axles. Weight 89g