Uni-Yarn is a standard, 2-strand, twisted, acrylic fly tying yarn, spooled instead of carded for convenience and to reduce wastage. UNI-Yarn comes in twenty-six colors: Black, Black/Camel, Bronze, Brown, Burnt Orange, Cream, Dark Brown, Dark Gray, Gold, Gray, Green Olive, Insect Green, Kaki, Kelly Green, Light Yellow, Magenta, Olive, Orange, Pale Yellow, Purple, Red, Salmon, Sand, Sun Yellow, White and Wine. Also available in Combo Pack of 20 spools.