Customized goods aren't eligible for the 7-day return.
Tips
culture
Short for 七天无理由退货, a consumer right codified in China's 消费者权益保护法 (Consumer Protection Law) amended in 2014, online purchases can be returned within 7 days without giving a reason, provided the goods are unused. Core selling point of Taobao/JD/Pinduoduo listings.
usage
Shoppers now use it elliptically as shorthand: '七天无理由吗?' ('Does it come with 7-day return?'). The full expanded form 七天无理由退换货 also includes exchange (换货).