Another promotional products-maker and its top executive have agreed to plead guilty for conspiring to fix prices of merchandise sold online, according to the U.S. Justice Department.

The guilty plea from Custom Wristbands of Burbank, Calif., and its owner and CEO Christopher Angeles comes one week after a Sugar Land company admitted using social media platforms and encrypted messaging applications to fix prices for its customized products, including wristbands.

Zaappaaz Inc., which does business as WB Promotions, and, and its president Azim Makanojiya agreed last week to plead guilty to one count of criminal violation of the Sherman Act, the federal antitrust law, according to the Justice Department.

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The plea deals are part of an ongoing federal antitrust investigation into price fixing in the online promotional products industry, according to the Justice Department.