5-peso and 10-peso coins

Have you ever wonder how a blind man can determine the difference between a 5-peso coin and a 10-peso coin by merely touching it?

  

As you can see they have the same diameter which is 27mm. If you really are that good maybe you can feel that inner section in the 10-peso coin. But sometimes it is very deceiving.

Well, for those who haven't noticed it yet, the 10-peso coin has an alternately rough side which the 5-peso coin do not have.

Try it when need to get a coin from your purse and it's dark or the lights are dim.

:D