1. Super durable steel sheet springs. 2. Stiff spring increases payload capacity. 3. Simple installation, modification required. 4. Stamped steel parts (shackles/brackets). Descriptions: This is a steel sheet spring kit with necessary for assembling and installation. Specifications: Thread: M3 Suitable for: D90 Color: black Material: metal Package Contents: 12 x Leaf Springs 3 x Accessory Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.