Made of stainless steel, these springs are more corrosion resistant than steel springs. They're also easier to extend than steel springs. As you stretch an extension spring, it gets harder to pull. 

The data is a single batch, manual measurement, there are errors!
The color of the photo may have a color difference due to the monitor!

Package include:

According to your choice!
If you need to purchase more than the inventory, please contact customer service to buy!