Item Type: SpringMaterial: Spring steelBox Size: Approx. 210 x 110 x 30mm / 8.27 x 4.33 x 1.18in(length x width x height)Product Weight: Approx. 380 g / 13.4 ozProduct Specifications:Pressure Spring:10 x (7 x 13mm) Pressure Spring10 x (6 x 12mm) Pressure Spring10 x (5.5 x 27mm) Pressure Spring6 x (9.5 x 16mm) Pressure Spring12 x ( 9 x 18mm) Pressure Spring8 x (9 x 35mm) Pressure Spring10 x (5.5 x 38mm) Pressure Spring10 x (7 x 19mm) Pressure SpringTension Spring:10 x (5 x 10mm) Tension Spring10 x (5.5 x 14mm) Tension Spring10 x (6 x 10mm) Tension Spring8 x (8 x 13mm) Tension Spring10 x (7.5 x 17mm) Tension Spring12 x (8.5 x 26mm) Tension Spring12 x (8 x 50mm) Tension Spring (Constant Section Ring)12 x (7 x 55mm) Tension Spring12 x (4 x 70mm) Tension Spring8 x (5 x 34mm) Tension Spring10 x (7 x 25mm) Tension Spring10 x (8 x 23mm)Tension SpringPackage ListPressure Spring:10 x (7 x 13mm) Pressure Spring10 x (6 x 12mm) Pressure Spring10 x (5.5 x 27mm) Pressure Spring6 x (9.5 x 16mm) Pressure Spring12 x ( 9 x 18mm) Pressure Spring8 x (9 x 35mm) Pressure Spring10 x (5.5 x 38mm) Pressure Spring10 x (7 x 19mm) Pressure SpringTension Spring:10 x (5 x 10mm) Tension Spring10 x (5.5 x 14mm) Tension Spring10 x (6 x 10mm) Tension Spring8 x (8 x 13mm) Tension Spring10 x (7.5 x 17mm) Tension Spring12 x (8.5 x 26mm) Tension Spring12 x (8 x 50mm) Tension Spring (Constant Section Ring) 12 x (7 x 55mm) Tension Spring12 x (4 x 70mm) Tension Spring8 x (5 x 34mm) Tension Spring10 x (7 x 25mm) Tension Spring10 x (8 x 23mm)Tension Spring1200PCS spring set supports different pattern and different sizes, forming a set, so that you no longer run around for multiple patterns, saving time. 2The packaging box is transparent PP plastic. After using the items in the box, this box can also hold some small accessories, fishing hooks, buttons, needles, etc. 3Meanwhile, the packaging box can also be placed or hung, and it is convenient to carry. 4Spring is made of spring steel material ,which also supports good extension and pressure. 5Tension spring and pressure spring are entitled with practical adoptability, keep its high performance for a long time.