Located along the southwest border between United States and Mexico, the construction of wall prototypes which started on Sep 26 "are making great progress", the CBP said in an earlier tweet.
Six companies are busy putting up their vision of what a wall would look like along the border just south of San Diego. Four of the walls will be made of concrete and the other four of alternate materials.
Media reports said that work on the prototypes started one week ago and all eight mock-ups will be completed in a month.
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President Donald Trump says he will pick the winning design in a month even though no funding has been approved by Congress yet for a border wall which he first proposed on his campaign trail to stop illegal crossing.
Photos released by U.S. Customs and Border Protection (CBP) show the prototypes lined up near the Otay Mesa Port of Entry.
During his 2016 presidential campaign, Mr Trump promised an entirely concrete wall modelled on those in Israel.
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The prototypes "are taking form or are near completion", CBP's San Diego branch tweeted.
With Mexico refusing to pay, Trump has said since taking office in January that the wall will initially need USA funding but that he will find a way to make Mexico ultimately pay for it.
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