Elon Musk is quite the hatter. 

Besides running a car company, a space company, a tunnel company and an AI company, he also managed to sell roughly $600,000 worth of hats, and the demand just keeps on rising. 

Musk's Boring Company sold 30,000 hats adorned with the company logo since they launched in October, Musk tweeted Monday. Just a few weeks ago, Musk said the company has sold $300,000 worth of hats, meaning the sales have roughly doubled since that time. 

If you order the $20 hat right now, you'll likely get it in 3-4 weeks. But you might want to hurry, as Musk says the hats will be limited to 50,000 pieces only. 

As people scramble to buy these boring hats, Musk is certainly having himself a good time. Besides making an outrageous amount of boring puns, he also changed his Twitter bio to "Hat Salesman," as you can see in the screenshot below. 

Musk (jokingly?) says The Boring Company will start selling a branded flamethrower next. The way hat sales are going, it would probably sell like crazy, too.