Not only are the Addi crochet hooks color coded to make it easier to identify individual hook sizes, it also has a strong and smooth aluminum head that avoids the risk of snagging, making it quicker and easier to crochet. The first part of the hook can be rotated to ensure that the ridged section lies comfortably in your hand, while also taking the strain of your hand and wrist. This special case contains 9 hooks in sizes 2.00, 2.50, 3.00, 4.00, 4.50, 5.00, 5.50 and 6.00mm.