3D Printed Crochet Hook - Patent Approved. Color chosen at random by what is available at the time of order - 6.5" -20 mm Hook. I have always had a passion for crochet hooks, so I used 3-D modeling and printing technology to create the perfect hook. I tested endless designs until I found the one that combined all of the most important features needed to crochet more comfortably and efficiently. It is hollow on the inside, making it lighter than a traditional hook, which makes crochet work go faster. It also have a twist and pointed tip for the most ergonomic and easy crocheting. xoxo, London Kaye