These F series blanks are discontinued, and I have one each of a few models left. The RX6 Rainshadow fly blanks feature RX6 Toray standard modulus graphite. However, there is nothing standard about the performance of these time tested models. Over the years the performance and technology of standard graphite has improved dramatically. These blanks cast smoothly and offer superb line control and durability. They are perfect for the first time rod builder, yet have performance a seasoned veteran will appreciate. Perfect for the fly fishing enthusiast to the professional guide.