Scar barrel with fishing line by Worker. This is the non-adjustable version where the degree of twist is fixed. The number in each product name refers to the degree of twist of the strings. These offer a consistent twist rate so that if you know what degree works best for you, you get consistent performance.
Strings eventually starting to wear out? Just get some replacement fishing line from wherever you are able to and restring the scar using the notches on the body. You'll end up with the same consistent degree of twist and won't have to worry about over or under twisting when you reinstall it on your blaster.
Body is SLA printed resin.