The Hyperpro Streetbox! This streetbox contains a replacement progressive front fork spring kit set and an adjustable emulsion shock absorber. The springs and shock provide easier cornering, a shorter braking distance, improved tire life, give a better balance in the bike and better overall feedback of your bike. The shock features manual preload adjustment and rebound adjustment with 50 clicks. The shock is equipped with a black color progressive spring ( a purple spring can be ordered as a free option). The shock is built with our modular system, so the shock is fully serviceable and any part can be exchanged if needed. The Streetbox is a perfect suspension solution to upgrade your bike!