I love shety, our teacher in first or second grade asked to bring these, and while almost everyone brought little childen's shety I had only big ones like in that shop)) This device could be an extremely usefull for Americans, by the way, because it's very easy to learn metric system which is based on 10s, same with shety, in the first row there are numbers 1-10, second row - 10s (one round thingy is 10, second - 20, etc), third - 100s, fourth - 1000s and so on.

You were asking in the comments, why we are still using this ancient thing, while you still have all those pounds and yards,lol! You can actually modernize your country if you bring shety back home!