I love working with the Cubics Interchangeable Needle Tips and would have rated them a full 5 stars except for the fact that I have had 2 size 6 needles snap in half. I don't knit tight and I wasn't forcing or pulling on the yarn. They just split. One broke off right at the place where the metal part starts and the other split vertically nearly the full length of the needle. As far as size 6 goes, I've order one more as I love the feel and the comfort on in my hands, but that's it - three strikes and it's out!