Created from the wood of non-fruit bearing olive trees, each addi® Olive Wood needle is finished with a plant-based oil to protect its unique look. The needles are quiet and comfortable to work with, as all tips and grips attain body temperature quickly, making them a great choice for arthritic hands. Available in 16-inch (40 cm), 20-inch (50 cm), 24-inch (60 cm), 32-inch (80 cm), 40-inch (100 cm), 47-inch (120 cm), and 60-inch (150 cm). Sizes are listed in approximate US sizes -AND- exact metric sizes for your convenience. All addi® needles are manufactured to exact metric sizes.