2.4 What material are the CMRV worm gears made of?

CMRV worm gearboxes are manufactured from an aluminum or cast iron housing and are available in sizes 30 , 40, 50, 63, 75, 80, 90, 100, 110, 125, 130, and 150. They are available with power ratings of 0.09 kW, 0.12 kW, 0.25 kW, 0.37 kW, 0.55 kW, 0.75 kW, 1.1 kW, 1.5 kW, 2.2 kW, 3.0 kW, 4.0 kW, 5.5 kW, 7.5 kW, and 11 kW.