RXF-91 Silhouette Gundam
A mobile suit built by Anaheim Electronics as part of the Silhouette Formula Project, it is based on the stolen plans and technical data of F90V Gundam F90 V.S.B.R. Type. While Silhouette Gundam has a different appearance, it Is technically a replica of Gundam F90V, featuring most of the new technologies incorporated into the Gundam F91, with the exception of the multi-layer armor and the bio-computer, which hadn't been completed by SNRI when Anaheim Electronics acquired Gundam F91's data.
The Silhouette Gundam was later upgraded into RXF-91A Silhouette Gundam Kai ("Kai" is Japanese Kanji character "改", meaning "modified" in English) by improving its reactor and the armor on the torso and cockpit hatch area.
Read more about this topic: F91 Gundam Formula 91