Advanced Level due to color work technique. If you have worked with two colors of yarn simultaneously before, you should not have a lot of problems with this technique. Full instructions can be found in the book, Twigg Stitch: A New Twist on Reversible Knitting by Vicki Twigg. Pattern contains written instructions only. Needle size: US 8 - 5.0 mm Yardage: 175 - 328 yards (160 - 300 m) Sizes available: Short 29" or Long 54"