Made from 6061-T6 a hard anodized alloy, make it very light whilst still retaining its strength and durability. Available in two base length eye to eye x travel options either 165mm x 35mm (6.50" x 1.38"), 190mm x 45mm (7.83" x 1.78"), 200mm x 51mm (7.87 x 2.01").

Watch the difference between a stock spring coil suspension vs an air shock absorber suspension:

Here is a side by side comparison of Spring suspension vs hydraulic shock suspension. Both are DNM shocks but see the difference between a spring suspension and a hydraulic shock below.

The air shock behaves similarly to hydraulic shocks with more damping but slower rebound.

Hydraulic/air shocks have lower resonance peak over bumps giving the rider less body stress. When resonance is high and stays high like on the spring suspension, the body absorbs that and over a period of time, the body will feel the stress. 

In the video above, you observe the spring suspension rebounds very abruptly, this creates high resonance and stress on the rider. 

User Manual: https://www.dnmshock.com/upload_files/products/18/ao-38rc.pdf