The white bamboo used is cold-resistant with a diameter of 3-10 centimetres, can grow up to 15 metres high and has the smallest and most numerous vascular bundles, making the surface dense, thin and easy to split. Because of the stalks' natural powder white colour, the variety is known as hachiku 淡竹 ("pale bamboo"). To ensure the chasen is sturdy enough, only bamboo that is about two to three years old is used in its production. The bamboo is cut to the right length, roughly quartered and then separated from the soft inner material so that only the sturdy outer layer remains. These are then further divided until the desired number of tines is reached, and then divided into inner and outer tines. A thread is run between them at the bottom so that they stay in place. To create the curved shape, the tines are pulled upwards with a knife, similar to curling a gift ribbon; this method applies pressure, keeping the tines in shape. Next, the individual tines are refined and gently sharpened to give the matcha as little surface area as possible to settle. Finally, the tines are pressed into shape until the desired result is achieved.









