Several prototypes of the long-promised “Trump Border Wall” are currently under construction in San Diego.

Six companies have been granted contracts from Customs and Border Patrol (CBP) to design the eight separate prototypes, which must be complete by October 26th of this year. President Trump has championed the building of an all-encompassing border wall along the U.S.-Mexico border for years, and it has become a lightning rod of controversy.

While there are slight differences in material and design between the early designs, they follow closely with guidelines issued by President Trump and CBP. They are 30 feet tall, mostly all cement, and appear to be impenetrable. Although CBP earmarked funding for the designing of the wall prototypes, funding for the wall in its entirety remains up in the air, subject to future negotiations in Congress.

While Democrats have universally opposed the construction of any border wall, Trump has indicated he is willing to make concessions with DACA recipients in exchange for the Wall. Along with funding for the Wall, Trump demanded that federal funding be blocked for so-called “sanctuary cities” and to roll out a merit-based legal immigration program.