If you're looking for superior bamboo needles look no further than the KA line. This is the oldest company in Japan and its expertise shows in every facet of the tool from a special rotary junction that prevents the cord from twisting to a silken yet durable finish. They are very light and cut on the straight grain from bamboo heartwood. Heartwood makes harder bamboo which yields excellent tips. Yarns, even acrylic blends, slide right over these needles. They walk the line between slippery and grippy without tipping in either direction.