Hi, everyone! How's it going?

In Japan, we can feel the coming of Fall by cool breeze in the morning or night.

When it gets cool, Japanese people long for  a cup of hot green tea.

Hot green tea is one of the Japanese mentality.


To drink hot tea, kyusu or teapot is indispensable.

Cast iron teapots of Chushin Kobo have been popular in our store.

The other day, we got new cast iron teapots!

That is... Color tetsubin teapots of Roji Associates!

Surprisingly, cast iron teapot get colors!!


Today, we would like to tell you the difference of teapots of Chushin Kobo and Roji Associates.

We hope this page will help you to choose your favorite teapots.


By the way, our store has similar item Nanbu tetsubin of Azmaya.

The other post compared the Nanbu tetsubin of Azmaya with cast iron teapot of Chushin Kobo.

Please also see that post.

The difference of cast iron kettle and cast iron teapot



Complete comparison! Chushin Kobo vs. Roji Associates

  1. Difference of producing area

First, these two teapots are from different producing area. In fact, these are two different traditional crafts.


Teapots of Chushin Kobo is a Yamagata casting.


Yamagata casting has 950 years' history.

Yamagata casting is characterized by the traditional casting called “Usuniku-birei”, which means the thin casting and the beauty of cast surface.

Thin casting skill can produce smart and elegant casting.

Another famous Japanese casting "Nambu tekki" is more solid and masculine.

Yamagata cassting was designated as Japanese traditional craft in 1975.



On the other hand, color tetsubin teapots of Roji Associates are Nambu tekki (Nanbu ironware).

Nambu tekki has 900 years' history.

Nanbu ironware was also designated as Japanese traditional crafts in 1975.

Casters of Nambu tekki have inherited the high skill with their great sensitivity and artistic quality.

Nanbu tekki has simple design, solidity, and beautiful surface of casting.

Nanbu tetsubin is the representative item of Nambu tekki.


2.How about the capacities?

Next, the important components of teapots; capacities.


Chushin Kobo offers 3 types × 2 sizes.

Followings are just a rough estimate.

* A cup of yunomi is about 120 cc (about 4 oz). A cup of mug is 240 cc (about 8.1 oz)


Marutama S: 2.7 cups of yunomi, 1.3 cups of mug

Marutama L: 8.5 cups of yunomi, 4.2 cups of mug

Marudutsu S: 3 cups of yunomi, 1.5 cups of mug

Marudutsu L: 8.5 cups of yunomi, 4.2 cups of mug

Hiratsubo S: 5 cups of yunomi, 2.5 cups of mug

Hiratsubo L: 11 cups of yunomi, 5.5 cups of mug


Contrary, color tetsubin teapots pf Roji Associates have 3 types.


The smallest type "Tsutsugata-Hakeme": 3 cups of yunomi, 1.5 cups of mug

Middle type "Dome-Arare": 3.4 cups of yunomi, 1.7 cups of mug

Largest teapot "Moon": 3.5 cups of yunomi, 1.8 cups of mug



Please select the most appropriate size teapot for your family or use.

3. How about the lineups?

To our pleasure, teapots of both brands are rich in variety.


As I mentioned, Chushin Kobo has 3 types × 2 sizes = 6 types.

Rounded cute form: "Marutama"

Stylush & cool: "Marudutsu"

Traditional teapot: "Hiratsubo"


All types are modern form with great traditional skill.


On the contrary, Roji Associates offers 3 types color tetsubin teapots.

Among 3, 2 types have 2 colors.

Smart form with pattern of traces of crushing: "Tsutsugata-Hakeme"

Tsutsugata-Hakeme has 2 colors, black and white × gold. This white × gold are not too showy.

Cool and calm presence: "Moon"

It looks black, but this is blue gray teapot.


And, cute form with traditional Nanbu tekki pattern: "Dome-Arare"

Dome-Arare also has 2 colors, black and white × gold.


We hope that you can get the difference of 2 teapots.

What we can see in common is both have great thermal conductivity. So, you can enjoy delicious hot tea for a long time.

Also, please note that both are teapots, not kettles. Please avoid cook over open fire.


2 teapots from 2 Japanese traditional crafts.

We hope that you will have a fateful meeting with our teapots.



Today's recommended items

Stylish cast iron teapot from Yamagata casting

Life with Nambu tekki! Color tetsubin teapot