ChiaoGoo patina, bamboo double points are made of Moso bamboo and have precisely tapered, hand-crafted tips. The size is permanently laser imprinted on each needle. Note: Sizes 0 (2 mm) through 2 (2.75 mm) come with six needles per set. Sizes 3 (3.25 mm) and above come with five needles per set. The patina color is obtained with thermal heat.