This is an optional Serpent Astro Shock Spring Set. These Purple - 2.2lbs springs are designed for use with the Spyder range of 1/10 off-road vehicles, and feature a shorter length making them ideal on even, high grip tracks, like astro and carpet, where a lower ride height is needed.

Astro Spring Options:

• SER500354: Orange 1.8lbs
• SER500355: Red 1.9lbs
  
• SER500356: Pink 2.0lbs
  
• SER500357: Blue 2.1lbs
  
• SER500358: Purple 2.2lbs
  
• SER500359: Green 2.3lbs