Shanghai's market regulator rolled out guidelines to regulate the mystery box market in the city, according to The Xinhua News Agency reports.
Mystery boxes or blind boxes give a random item when opened, greatly popular among young people.
According to the city's administration for market regulation, the price of mystery boxes will be set to be no more than ¥200 (about $31.5).
The guidelines also said that sellers should not sell these boxes to children under the age of eight, or carry out excessive marketing and speculation.
Sources with the mystery box giant Pop Mart expressed supportive attitude towards the guidelines and said that the company will cooperate with the regulator to explore feasible detailed schemes.
The new move comes after a statement made by the China Consumers Associatio, noting that fast food chain KFC's newly launched set meal that offered limited-edition surprise box gifts had caused irrational and excessive purchases of food.
This sales tactic goes against public order and good custom, and breaches the spirit of the law, the association said.
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