The Knitpro Jumbo Birch Crochet Hook is a birchwood crochet hooks in Jumbo sizes. They are perfect for big knitting projects, amazing strength, smooth finish. They are easy, effortless movement of yarn. Hand crafted by skilled artisans. All hooks have grooves that prevent stitch slippage. All hooks manufactured using natural birch wood. Lightweight, strong wood, larger size works well with thicker yarns. Warm to the touch, gentle in the hand and ideal for everyone.