RC crawler and basher builders, these Axial super firm shock springs are for when you need to stiffen up your suspension. This pack includes TWO identical springs. The specs are: 12.5mm in outer diameter, 20mm in length (uncompressed), with a spring rate of 7.95 pounds per inch. The blue color identifies them as the 'super firm' option in Axial's lineup. They're made from steel and are a direct replacement/upgrade for the stock springs on many Axial and other 1/10 scale RC trucks. Installing firmer springs helps prevent your truck from bottoming out on big jumps, reduces body roll for better handling, or just gives you a more controlled ride if you're running heavier components. Make sure the dimensions match your shock bodies before you buy. A simple and effective way to tune your RC's performance. Made in Taiwan.