NX Series:.* Double fiber nylon is used for the end line (bass).* Both ends (bass) are wrapped with silver-plated wire.* High quality P100 nylon is used for both ends.* Ending with flat feel/full shade.* Recycle anti-rust coating.* Extremely light weight and high quality, has a long service life. Specifications:Brand: Orphee Model: NX35(28-45), NX36(28-43)Quantity: 1 Set/6 Pieces Material: Nylon P100 Type: Classical Guitar Packing List:1 Set of RX Series Guitar Strings:.* Durability and excellent sound are essential for good strings, and each set of Orphee strings are guaranteed to give you a great sounding experience.* The internal wiring is hexagonal carbon steel core, clear and shiny sound and shrill sound.* The tone is rich and warm with abundant harmonics.* Extremely light and high quality, it has a long service life. Extra Light- (9-42) RX15, Blue Pack. For a super easily playable experience, tailored overall to the songs and a nice clean feel.Light- (10-46) RX17, Green pack. This string set tend to be more durable than the "extra light" string set, while maintaining durability and a pleasant sound.Medium- (11-50) RX19, Gray pack. Popular in blues and rock, they provide substantial sound while still allowing for some degree of string bending. Specifications:Brand: OrpheeModel: Supplemental Light- (9-42) RX15/Light- (10-46) RX1