This is a Fox Shock DHX 4.0 Coil Shock-Rear 500x2.80 that is perfect for your Specialized Santa Cruz Downhill or Mountain Bike. The shock type is a Coil Shock and the eye to eye measurement is 8.75 inches. It is a compatible part for your bike and comes with a coil spring and rear shock. The set includes one item that is part type Rear Shock. This is a great addition to your bike and is sure to improve your ride. Not sure the stroke length.