RBX electric 4-string bass guitar. The RBX170 offers big low-end tone, ergonomic body design and a 3-D headstock. The RBX progressive design offers effortless playability and the smooth tapered feel of the bolt-on neck creates a very comfortable feel. The RBX170 features specially designed humbucking pickups, two volume knobs and a master tone control. It’s the perfect choice for value-minded players who demand top of the line quality.