C.S. Osborne #9 Wire Eye Combo. 5 Gross. The complete button includes the Wire Eye and the shell of your choice. The shell options are Soft Shell, Rust Resistant, and Aluminum Shell. Available in the following sizes. 22, 24, 30, 36, 40, 45, 50, and 60. Wire Eye #9 has a large eye for ease of threading tufting twine.