Elon Musk has said that Tesla will ditch two of seven Tesla colour options, in order to ease the production process.

The Tesla CEO said on Twitter (NYSE: TWTR) that he will be dropping Obsidian Black Metallic and Metallic Silver.

“Moving 2 of 7 Tesla colors off menu on Wednesday to simplify manufacturing,” he said on Tuesday. “Obsidian Black & Metallic Silver will still be available as special request, but at higher price.”

From Wednesday, the five remaining colours will be Solid Black, Midnight Silver Metallic, Deep Blue Metallic, Pearl-White Multi-Coat, and Red Multi-Coat.

On Friday, Musk sent a note to employees optimistic about the quarter and cars on the production line.

“We are the most amazing quarter in our history, building and delivering more than twice as many cars as we did last quarter,” said the note.

Musk has been in headlines multiple times over the past year. Last week, the CEO appeared on Joe Rogan’s podcast where he smoked marijuana and drank a glass of whiskey.

The following day, the Chief Account Officer Dave Morton and Chief People Officer Gaby Toledano both resigned from the electric car group.

His appearance on the podcast caused shares in the group to drop six percent.

“It’s particularly troubling given the issues that he has had already,” said Kabrina Chang, an associate professor at the Boston University Questrom School of Business in the US.

“If I were a board member or investor, this would not give me a ton of confidence that he’s moving in that direction. It does not seem like forward progress in terms of governance and professionalism of Tesla.”

Shares on Friday closed at $263.24 a share, the lowest since April.

Shares in Tesla (NASDAQ: TSLA) are currently 285.00.