It's just a pneumatic solenoid valve stack. Depending on how large your cylinders are and how much air they take, there are different sizes of valve.
There are also different types of "spools" in the valves depending on what type of actuation you want and what type of cylinder you have (single- or double-acting). Do you want "on" to extend the cylinder and "off" to retract it? Do you want the cylinder to remain in its position if you lose power, or do you want it to retract? Etc., etc...
Take a look here:
Don Kansas City