This set consists of four complete, superdetailed late exhaust assemblies. The first B-1Bs were fitted with turkey feathers covering the exhausts. Early in the program, it was found that vibration problems were splitting and breaking them, so they were removed from all subsequent Bones. This set contains late style uncovered rear engine faces with flame holders, exhaust tubes, exposed exhaust nozzles and 54 separate radius rods that allows you to build a super detailed late B-1B. Surprisingly easy assembly that yields a very detailed model. Complete with instructions. For the Revell B-1B kit.