product description:
Common perception of all over the world
Abacus have long history. Perhaps it s history equal to human s. There are various method and tools to count, but common concept is "more easier to handle number". Interestingly, the method for this purpose is almost same from east to west.
What s Soroban ?
Soroban is a kind of these tools (Abacus). Especially, these in East Asia are called "Soroban". The original Abacus was consisted with ditch on plane and the ball moving on it. The shape and number of balls have been changed for usefulness. For example - there are some scene required to calculate speedy. The number of balls and shape - this is the current standard.
Features
1. Material - Birch ball. Move smoothly, stop firmly. Good material (wood) have this confliction. Birch is most popular. The balls of Abacus grow like your skill. Gradually, the feature of wood become clearly.
2. Digits - 27. It is said 23 digits is sufficient to handle number in the many scene. Of course, you will handle much number as you progress. But you will be able to calculate some digits without Abacus because of your effort. But if you want to calculate distance to edge of universe... perhaps 27 digits is needed. As a matter of fact, it is your preference. (You might want to consider bag size. Longer than 23 digits.)
Soroban grow also
Soroban (Abacus) grow like your skill, but need definite time. So, in case you are going to handle for a long time. Good one become good your "own" Soroban. In that sense, this one is standard.
Material : birch ball, ebony frame / 15×0.6×2.5 (inch) / 6.7 (oz) / Japan Import
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![Standard Soroban (Abacus) / 27 digits [47300]](https://images-na.ssl-images-amazon.com/images/I/41XSL9XC11L.jpg "Standard Soroban (Abacus) / 27 digits [47300]")
