This thread is a stranded form of GSP which has incredible strength for its size. Advertised as "almost unbreakable", it allows tying techniques never before possible while minimizing thread build-up on small flies. Loosely twisted, it is the only GSP thread that can be split for dubbing loops, although it is fine enough to be doubled for loops without excessive build-up. The white thread takes marker colors easily. This 30 denier thread has a breaking strength of 40 oz. (1.14 kg). 50 meters per spool.
GSP fibers are quite tough and can damage edges on fine scissors and stainless bobbins. The makers recommend using a ceramic bobbin and cutting with a razor blade. This thread is very durable, however UV cure and water-based cements can be used for appearance or texture. Solvent-based glues and coatings are not recommended. This thread consists of 16 strands, each of which has a weight of about 2 denier and a breaking strength of about 2.6 oz. (75 grams). The user can split the thread into individual strands or twist any number of strands into thread. Two strands would have a weight of 4 denier and a strength of about 5 oz. Four strands would be 8 denier and 9.8 oz. Eight strands would be 15 denier and 19.6 oz. (560 grams).