The interchangeable addi knitting system features 8 pairs of olive wood needles in a soft and premium faux leather case. Olive wood needles are highly stable, and they are unique due to their beautiful grain. The tips are finished with natural waxes. To be more precise the different sizes of addi Turbo™ tips are the following: US 4, 5, 6, 7, 8, 9, 10, 11 (Metric equivalents: 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 8mm). Each tip is 5″ / 12.5 cm long. The Addi’s wallet case measures 9″ W x 6.5″ L x 1″ H when closed. Also, the case contain 3 different lengths of pliable blue cord (to make circular needles 24″, 32″ and 40″ long). You can use the connector piece either to join the ends of your working cable together so that it becomes a stitch holder or to join two cords together for longer lengths. Moreover, additional tips and cords are available in the folder on the back of the case (please note, 16″ cords will not work with your Olive set, and 20″ cords are not recommended).