This is the 9425th most frequent German word.
metallfäden
Metal threads.
The word 'Metallfäden' here is used to describe parts inside older devices, emphasizing their physical properties as 'zerbrechlich' ('fragile').
Die alten Geräte enthalten oft zerbrechliche Metallfäden.
The old devices often contain fragile metal threads.
Here, 'Metallfäden' is used as the object of the verb 'eingearbeitet', indicating the material being incorporated into the fabric.
Die Metallfäden wurden kunstvoll in das Gewebe eingearbeitet.
The metal threads were artfully woven into the fabric.
In this sentence, 'Metallfäden' appears as the subject, describing its property and utility.