These are an upgrade for the Axial SCX10 axles housing that benifit the rig in several ways. They add weight down low to help the center of gravity of your rig, enabling you to run less rotating weight in the tires. They also "Beef" up the axle housing itself to help keep from 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.
They will work in both the front and rear axles.
You will receive two Standard Tubes (enough for one axle).