Beef Tubes are an upgrade for plastic axle housing that benefits the rig in several ways. They add weight down low to help the center of gravity on your rig, enabling you to run less rotating weight in the tires. They also "Beef" up the axle housing itself to help keep from breaking and/or snapping the housing in half. Another benefit is that they give you a solid metal mount for the c- hub screws, instead of the stock thin plastic that normally holds the c-hub screws and strips out easily.