Walmart has started making its first deliveries by drone, launching a small pilot program this week in Fayetteville, North Carolina. The retailer will be delivering “select grocery and household essential items” using automated drones operated by Israeli startup Flytrex.

Each of the drones can fly at speeds of 32 mph, travel distances of 6.2 miles in a round trip, and carry up to 6.6 pounds (that’s roughly “6-8 hamburgers,” according to converted units offered on Flytrex’s own website). A demo video of the drone shows how it lowers packages to the ground from 80 feet in the air rather than having to land itself. Flytrex received approval from the FAA to test food deliveries in North Carolina last year, with caveats that its drones only fly predetermined routes in the daytime over unpopulated areas.

Walmart has offered few details on the program, including how many drones are involved in the pilot and what checks (if any) customers need to make before receiving a delivery.

“We know that it will be some time before we see millions of packages delivered via drone,” said Walmart senior vice president Tom Ward, in a news post. “That still feels like a bit of science fiction, but we’re at a point where we’re learning more and more about the technology that is available and how we can use it to make our customers’ lives easier.”

Walmart has been looking into drone delivery for many years, making its first tests back in 2015 and experimenting with using drones to check inventory in its warehouses in 2016. Moving from internal tests to customer deliveries is a big step, though. Although delivery drones have been on the horizon for many years, a number of challenges, like safety regulations and high costs compared to traditional delivery, have slowed adoption.