This large Chinese abacus is 6" x 12". The Chinese abacus is made of wood and includes instructions on how to use an abacus. The Chinese abacus enables a simple method of mathematical calculating. Long before the invention of the modern calculator, mathematical equations were required for many reasons within many civilizations and many alternative methods of calculating were discovered, some very similar to the Chinese abacus. The Chinese abacus is still used today and has survived for over 5000 years.