Aluminum, twin tube, single adjustable shocks. Coil-over hardware kit comes with the shock. Good shock for crate late models. Z in part number represents short rod end style. • 5” – Compress Length = 11.18” Extended Length = 16.10” • 6” – Compress Length = 12.18” Extended Length = 18.10” • 7” – Compress Length = 13.18” Extended Length = 20.10” • 8” – Compress Length = 14.18” Extended Length = 22.10” • 9” – Compress Length = 15.18” Extended Length = 24.10”