The Addi CLICK Mix set is a fabulous and unusual interchangeable set. What's different about this set? Well, flexibility. Each tip set contains 1 regular turbo tip, and one rocket tip (slightly sharper) so, depending upon what type of knitting your doing, you have the choice of using either tip. Toatl flexibility! It includes tips from US4 - 11, SOS cords in 24, 32 and 40" lengths, and the addi gauge and pin, plus its in a perky yellow case!