The RockShox MC3R Rear Air Shock is designed for mountain bikes, specifically with a 6.5-inch eye to eye measurement. Made of durable aluminum, this shock is in a sleek black color and includes everything needed for the rear of the bike.  With the trusted RockShox brand, this component provides motion control for a smoother and more comfortable ride on rugged terrains. Holding Air, compression and rebound are working.