Kashyyyk treeworm silk

The silk produced by Kashyyyk treeworms was valued for its significant tensile strength. The material was available in the area around the planet of Bespin and its durability was unmatched in that region as of }} 3 ABY.

Behind the scenes
The silk of the Kashyyyk treeworm was mentioned in the flavor text of a card from the Star Wars Customizable Card Game's Cloud City Limited expansion set.