Cassini's Hydrazine Supply
One tank, that at launch contained 100 kg of hydrazine (H4N2), supplies all the propellent needed by Cassini's sixteen thrusters for intermittent use over the life of the mission. The hydrazine-fueled rocket thrusters are used for attitude management and the occasional velocity adjustment.
The hydrazine tank can be seen mid-right on the illustration below, which shows the entire Cassini Propulsion Module Subsystem. The four hydrazine Thruster Clusters (4 thrusters on each) are also visible.
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Propulsion Systems in the Basics of Space Flight