Lykke 3.5" Interchangeable needles come with compatible 16, 20 and 24 inch cords. Lykke needles are beautiful to both look at and use. They are light in the hand and made of birch wood. The tip has a sharper point and they are more slick compared to other wood needles. Both US and metric sizes are etched on the needles. Lykke is the Norwegian word for happiness and these needles make us happy!