Chasen, a bamboo whisk is an indispensable accessory for a proper-made matcha. The whisk is traditionally carved out of a single piece of bamboo. This piece is made of Shichiku (紫竹), or purple bamboo and is shaped according to the shin (真) style. Made in China.To clean, only use water, without any chemicals.
More about the finely ground tea leaves and how to make it, please follow the link.