What's a MIX Set? Its an interchangeable set where each set of tips is actually two different types in the size - so the 9 tips are a mix of a turbo tip & a lace tip - so, you can use whichever tip is best for the type of knitting your current project requires. If you are doing a lace shawl that has both lace and stockinette, you can use the sharper rocket tips for the lace, and switch to the Turbo Tip for the stockinette. The combinations are endless!