The Maso-Bamboo, the world largest and strongest Bamboo, is used for the Bamboo Double Points. Only in China does it reach ist optimal growth height of up to 30 meters. Its special features are one of the secrets of the ChiaoGoo bamboo needles. The patina effect is achieved through a special heat refining process. The tipps are extremely light, which alows longer working without fatigue. The needle thickness is permanently laser imprinted on each needle.