How it is made
A traditional chasen is carved from a single piece of bamboo, with no joins. The lower part becomes the handle; the upper walls are split into fine strips and curved inward to form the prongs. The whole process, done by craftspeople in Nara, the city with the longest chasen tradition in Japan, can take up to two hours per piece.
The world’s largest producer of handmade chasen is Takayama, in Nara prefecture, where 90% of all the chasen in the world are still made. It can take a family of craftspeople years to learn the whole trade.
Prong count and what it is for
- 72 prongs (shiju-ni-hon-date): basic use, accessible price. Enough for usucha.
- 80 prongs (hachi-juu-hon): the everyday standard. A good balance of durability and foam.
- 100 prongs (hyaku-hon): a finer, denser foam. The most popular with regular drinkers.
- 120 prongs (hyaku-ni-juu-hon): a very dense microbubble foam. The favourite for a formal ceremony.
Which one to buy
With those criteria in hand the Amazon list thins out on its own: the listing has to say how many prongs, has to say bamboo rather than plastic, and should not say the whisk is dishwasher safe. Very few are left.
The one that meets the most of them is the VMUTGA 100 prong bamboo chasen (see the price on Amazon). Its listing states the 100 prongs, says it is hand carved from a single piece of bamboo, which is how a real chasen is made, and warns that it is not dishwasher safe. That last point is rarer than it sounds: most listings in this category tick the opposite box, and a dishwasher warps the bamboo and snaps the prongs.
If you would rather have a brand that prints the care instructions on the box, the NaturaleBio 100 prong bamboo chasen (see the price on Amazon) also states 100 prongs and natural bamboo, and the instructions it gives are the right ones: water only, no soap, air dried.
There is a big seller we do not link: its title says 80 prongs and the first line of its own listing says 100. When a listing contradicts itself on the only figure that matters, there is nothing left to verify. And below 8 euros the listings drop to 72 or 76 prongs, or give no number at all, which by this guide’s own rule means there are probably fewer than 72.
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How to look after it
- Before first use: soak it in warm water for 2 minutes to hydrate the bamboo.
- After every use: rinse with hot water and swirl gently to clear the matcha residue. Never use soap.
- Dry it on its stand (kusenaoshi). The prongs need to dry in the right curve.
- Never in the dishwasher and never above 80 °C: the bamboo warps and the prongs break.
The stand is not a luxury: it is what decides whether the chasen lasts three months or six. The Goodwei Chasentate ceramic stand (see the price on Amazon) is the only one we found that gives its dimensions (6.3 cm across by 7 tall) and which whisks it fits, from 80 to 120 prongs. Without that figure you cannot tell whether the chasen will sit loose or forced, and forced is worse than no stand at all.
When to replace it
Looked after properly, a chasen lasts 3 to 6 months of daily use. The signs it needs replacing: broken or loose prongs (they can end up in the tea), permanent warping that stops you whisking properly, or bamboo that has darkened and looks dry. Never use a chasen with broken prongs.