This is the Flynoceros Aether 5" stretched X racing frame with 4.5mm "race special" arms.This frame is backed by the limited lifetime warranty replacement program, offered direct through Flynoceros. All warranty claims should be directed to www.theflynoshop.comFeatures:Minimal hardware4 bolts to remove armsStack is not connected to the arms for superior durabilityStretched X designSoftmounted roll..