The prototypes for Trump's border wall are nearly finished — see what they look like

• The Trump administration tasked six companies with creating eight prototypes for the US-Mexico border wall.
• The prototypes are nearly complete, and will be unveiled October 26.
• Trump has said he plans to inspect the prototypes himself and choose the one he likes best.

Construction is wrapping up on eight prototypes for President Donald Trump's long-promised wall along the US-Mexico border.

Customs and Border Protection took to social media on Tuesday to share video of the nearly complete prototypes, which are set to be finished by the October 26 deadline.

The government selected six companies to construct the prototypes, which the agency said are meant to "inform future design standards" for the wall.

Although Trump's plans for a border wall have been beset by a number of obstacles — including the Senate's refusal to green-light a $1.6 billion down payment, wavering estimates on the total cost, and a lawsuit from California — his administration has moved ahead with the prototypes.

Here's what they look like so far:

The eight prototypes have gone up near the Otay Mesa port of entry in San Diego, California.

Four of the prototypes are concrete walls.

The other half are made of "other materials," which have not yet been specified.