Standard hardware, track and springs: 2" track with adjustable clips (3" track for double car customs), 15" radius standard lift. 3-5 hinges per section (14 gauge). 2" steel rollers with nylon outer races (11 ball). One 2 1/4" strut per section for traditional, semi custom models; one 3" strut for customs. 10,000 cycle Torsion springs.