Thousands of counterfeit Gibson electric guitars were seized at the Los Angeles-Long Beach Seaport, according to U.S. Customs and Border Protection.

U.S. Customs and Border Protection (CBP) said Tuesday that $18 million in fake Gibson guitars were seized in California, which the agency called the “largest counterfeit musical instrument seizure on record.

Authorities are calling it the largest seizure of counterfeit musical instruments at the busiest container port in North America.