Tesla has started production of its Optimus humanoid robot at its factory in Fremont, California, a manufacturing space once dedicated to making electric vehicles, the company announced Wednesday.

“The bots coming off this line are the first production-quality bots that we have manufactured,” Tesla wrote in its third-quarter letter to shareholders. “While we will continue to iterate on the hardware and manufacturing process, we have proven that the current manufacturing process for Optimus is suitable for a commercial product.”