Metal Stone Faces follow the same concept as Regular Stone Faces; the Stone Face acts as a Screw/Bolt to keep the Beyblade tightened together. However, it is, obviously, made of metal. It focuses on an Octagonal shape, rather than a Hexagonal shape used in the previous HWS and 4D Systems. The Bolt also seems longer than its predecessor, most likely to deal with the occompaniment of new kinds of wheels.
Flame Red Ver.
This is the Zero-G Metal Stone Face. It resembles the Metal fusion/Masters/Fury metal facebolt ver. 2.