What ArcHivist Hegelia termed headblocks were a component of the Cyber-helmet of certain Cyber-subspecies, appearing at either side of the faceplate and connected to the cranium bulge by side handles. (AUDIO: The Cyber Nomads)
The Cybermen of the early CyberFaction which waged the first invasion of Earth sported striated headblocks. (TV: The Invasion) These headblocks were retained by their descendants, the CyberNomads. The nomad Cyber-Leaders were distinguished by black side handles and headblocks on an otherwise silver Cyber-body. (TV: Revenge of the Cybermen)