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The earliest known written documentation of the Chinese abacus dates to the 2nd century BC Abacus can be used for functions other than counting. Unlike the simple counting board used in elementary schools, very efficient suanpan techniques have been developed to do multiplication, division, addition, subtraction, square root and cube root operations at high speed. There are currently schools teaching students how to use it. These are an fashionable complement to blue, white, and many other French cuff shirts and can be worn by both men and women. Each pair is finished by hand to ensure a quality, lasting pair. Nice lightweight feel works well with French cuff shirts and blouses. Set in rhodium silver frame so it never needs polishing. Great for dinners, birthday, clubs, party, weddings, graduations, events, and special or formal occasions.