1. Package: 200pcs springs. 2. Material: galvanized steel. 3. Compression springs: -5.5 x 17.5/ -5.5 x 38.0/ -6.5 x 10.0/ -7.0 x 12.5/ -7.0 x 19.0/ -9.0 x 35/ -9.5 x 16/ - 9.5 x 19mm (the quantity as shown in the picture). 4. Tension springs: -4.0x79.5/ -4.5x44.5/ -5.0x20.5/ -5.5x25.5/ -6.5x22.0/ -7.0x98.0/ -7.0x51.0/ -8.0x28.5 / -8.0x31.5/ -8.0x44.5/ -8.5x36.5/ -8.5x47mm. (The quantity is as picture shown.) 5. Usage: Widely used for automotive tools and engines, medical equipment, large appliances, electronics and sensitive measuring instruments.