The LYKKE Indigo 9cm (3.5") Interchangeable Needle Set is an integral part of my kit bag, and I love it. I use it as has my hat knitting kit, using the cords for 40cm (16"). I'm a big hat knitter, so this is a well-used and loved set of needles. It's not limited to just hats; it's great for other projects that call for longer cords. Named after the Norwegian word for happiness, LYKKE combines high-quality materials and thoughtful design to produce beautiful, durable, happy-making needles. Made of birchwood, they're soft and warm to the touch and smooth on the yarn. The 9cm (3.5") interchangeable set comes with 9 pairs of needles: 3.25mm - US 3 3.50mm - US 4 3.75mm - US 5 4.00mm - US 6 4.50mm - US 7 5.00mm - US 8 5.50mm - US 9 6.00mm - US 10 6.50mm - US 10.5 The 7mm (US 10.75) needles are not included in the set; they're available to purchase separately. Also included are the following: x2 cords for 40cm (16") x1 cord for 50cm (20") x1 cord for 60cm (24") x2 connectors x4 keys x8 stoppers Click here for the full range of LYKKE Indigo products at The Needle Store. Check out our 'LYKKE Interchangeable Needles - Sizes Explained' article for help with cord and needle length definitions.