Hoverboards may have been a highly popular gift to unwrap this holiday season, but now they are a popular item to be snatched by the U.S. Customs and Border Protection due to the explosive reputation of the two-wheeled, motorized devices.

The agency seized 15 of the self-balancing scooters Dec. 29 at Washington Dulles International Airport. The hoverboards, which were made in China and arrived from Japan, would sell for a retail price value of about $4,500, according to release from the CBP.

There have been many cases of the highly sought after devices catching fire, possibly caused by substandard and counterfeit lithium ion batteries that power some of the hoverboards.

The U.S. Consumer Product Safety Commission is examining the fiery trend. According to the CBP release, the counterfeit batteries are not a brand new concern. The agency also seized a shipment of 445 hoverboards on Dec. 16 in Norfolk. That shipment was valued at about $171,000.

“Customs and Border Protection will continue to work closely with our trade and consumer safety partners to identify and seize dangerous products, like these hoverboards,” Wayne Biondi, CBP Port Director for the Area Port of Washington Dulles said in the release.