Specifications:Good elasticity and durability.The corrosion resistance is stronger.Used in automobile engines, main electrical appliances, medical devices, electronic products and sensitive measuring instruments.Type: Coil Spring SetMaterial: SteelQuantity:Pressure Spring:7*13 (10pcs), 6*12 (10pcs), 5.5*27 (10pcs), 9.5*16 (6pcs), 9*18 (12pcs), 9*35 (8pcs), 5.5*38 (10pcs), 7*19 (10pcs)Drag Spring:5*10 (10pcs), 5.5*14 (10pcs), 6*10 (10pcs), 8*13 (8pcs), 7.5*17 (10pcs), 8.5*26 (12pcs), 8*50 (12pcs), 7*55 (12pcs), 4*70 (12pcs), 5*34 (8pcs), 7*25 (10pcs), 8*23 (10pcs)Features: Assortment Kit, Durable, ElasticCase Size: 21cm x 11cm x 3cm/8.27" x 4.33" x 1.18" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 Set of Coil Springs (200pcs)