The CB-3000 is an elegant model that can be worn comfortably for long periods without discomfort or detection. It's cage has a slightly lower profile, and the length of the cage is slightly less than the CB-6000. The seam of the cage runs (more or less) horizontally around the cage, as in contract to the CB-6000 which has the weld seam on top and bottom of the cage, which some claim is a stronger design. The inner diameter is also slightly larger than the CB-6000 (1.45" vs 1.3875")