These amazing bamboo circulars feature smooth tips, seamless joints, the same flexible cords as Addi Turbos, and a wide range of sizes and lengths! Sizes 6-10.5 in all lengths are Addi Nutura needes. Sizes 11-17, which only come in the 24" and 32" lengths. are Addi Profi needles. This is the way Skacel markets their bamboo needles. Why? We're not sure, as there's not much difference between the two. Note the picture of the Profi needle at the bottom of this page.