LYKKE Grove IC tips are made of bamboo. The raw bamboo is treated with LYKKE's proprietary process which enriches the bamboo to strengthen and smooth it, as well as add a touch of green that evokes the feeling of bamboo just cut from a grove. The Grove knitting needles are easy on the hands and the eyes making these tips a pleasure to work with. All LYKKE knitting needles have both US and metric sizes etched on the needles to ensure long-term readability. The LYKKE 3.5" Interchangeable Knitting Needle Tips are sold in pairs with needle sizes US 3 to US 10.75.