addi Swing crochet hooks were developed with comfort in mind and color coded for easy organization. The handle is constructed of two plastics: one colorful and soft, and the other, white and firm. The two balance each other perfectly for just the right amount of flexibility. Available in: US A (2.00mm), B (2.50mm), C (3.00mm), D (3.25mm), E (3.50mm), 3.75mm, F (4.00mm), G (4.50mm), H (5.00mm), I (5.50mm), J (6.00mm), K (7.00mm), and L (8.00). Sizes are listed in approximate US sizes -AND- exact metric sizes for your convenience. All addi knitting needles are manufactured to exact metric sizes. Please Note: Every addi product purchased from an Authorized addi Dealer comes with a Lifetime Warranty from any manufacturer"s defect.