'Shekels' in the Bible

"My lord, hear me. A [piece of] land [worth] four hundred shekels of silver--what [is] that between me and you? Bury your dead."

Then Abraham listened to Ephron, and Abraham weighed for Ephron the silver that he had named in the hearing of the Hittites: four hundred shekels of silver {at the merchants' current rate}.

And it happened [that] as the camels finished drinking the man took a gold ring of a half shekel in weight and two bracelets for her arms, ten shekels in weight,