This replica head is made mainly from a fibreglass replica of a Derwent Flame-tube from an aircraft engine (the thing that was used to make the original).
To this have been added six standard PL-259 UHF-Type Coax Connectors (with the wire connectors unscrewed and removed), an eyepiece from a 4x20 scope and a set of fan-sculpted resin cast "eyes".The holes in the upper section of the head have had a red gel-coat style lense glued inside and a bulb has been installed inside to allow the eyes to light up.
More from Star Wars: Episode V - The Empire Strikes Back (1980)