The addi Click system provides 10 different sizes of addi Turbo™ tips (US 4 – US 15), three different lengths of addi's new, pliable blue cord (24”, 32” and 40”), and one connector piece which helps to either store stitches or combine your cords. The Click tips require no tools to change; simply insert the cord deep into the tip, twist and release. The tips will remain secure until you change them. If you love addi Turbos, Click is the way to go. Have all the needles you need in one convenient carrying case.