What gives 5% critical hit chance and 50% critical damage?

I did not have anything equipped:

But I still had 5% critical hit chance and 50% critical damage. What causes this?

Update: Broken Promises

@Aequitas, @Chippies: 5% CHC means 1 of 20 hits is critical. And this means 3 of 4 times one will get the 3 seconds. Being able to do 2 attacks per second means that you have less than 6 successful hits, probably 4. The bottom line is for more than 5 non critical hits one will get less than 5 critical hits. And this equals to less than 50% CHC, which is almost the same as putting CHC on every item. And this means the ring is nice but not exceptional. If it would be possible to get 0% CHC, the ring would be exceptional, because then it would be possible to get more than 50% CHC overall.

That's the base level all Diablo III characters have.

Characters have a base 5% crit chance and a base 50% crit damage

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