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 Set Material: Steel Quantity: 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, Elastic Case 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 items 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)