This tiny combination of plastic, glass, and metal is a disposable cannabis oil cartridge. It costs anywhere from $30 to $70 (depending on the oil inside), is easily carried in your pocket, and produces little-to-no smell when consumed. You simply screw it into an inexpensive, rechargeable pen and inhale. That’s it.

It’s this tiny device that’s quickly taking over cannabis consumption in America’s largest cannabis market: California. Nearly a quarter of sales from 2016, tracked by marijuana delivery service Eaze, were for cartridges:

This data comes from Eaze, a marijuana delivery service that operates all over California.

Similar growth rates are showing up outside of California as well.

States like Colorado, Washington, and Oregon — where cannabis is legal — are showing massive percentage growth for “concentrates” (cannabis oil), according to BDS Analytics.

Click to read the entire article on Business Insider.