However, these toys could be on the way out as well.
Inspired by a 15,000-strong Facebook group run by a woman who tests consumer products for lead, the US Public Interest Research Group tested 12 fidget spinners sold by Target and found two with unsafe lead levels, reports CBS News.
Consumer group U.S. PIRG is asking Target to recall two types of fidget spinners for possibly containing risky amounts of lead.
The issue Fidget Spinners are not technically classified as a children's product, so they have different legal limits when it comes to lead.
The legal limit for lead is 100 parts per million. Another product, the Fidget Wild Premium Spinner Metal, had 1,300 ppm. "Saying fidget spinners aren't toys defies common sense, as millions of parents whose kids play with spinners can tell you".
MASSPIRG, a consumer advocacy group, alerted Target and Bulls i Toy, the distributor.
Shares of Target were last seen down fractionally at $58.17, with a consensus analyst price target of $59.28 and a 52-week range of $48.56 to $79.33.
MASSPIRG recommends that adults and children immediately stop their usage of these fidget spinners.
However, the fidget spinners are sold near children's toys in stores.
"Safety is one of our top priorities", said a Bulls i Toy spokesperson in an email to the Washington Post.
The popular little toys are already the subject of Consumer Product Safety Commission choking hazard warnings.
Fidget spinners are still all the rage among the young crowd. Additionally, the packaging for the brass spinner says the toy is appropriate for ages "6 and up".
On Thursday, Cleveland 19 used a lead test - intended for paint and found at hardware stores - to test the product.
According to Kara Cook-Shultz, the toxics director at US PIRG, it doesn't matter how the CPSC classifies these spinners - they're still being marketed as toys for kids.
A statement from a senior communications manager for Target, Jenna Reck, said this, "Target is committed to providing high quality and safe products to our guests, and we closely review all product safety claims that are brought to our attention".
U.S. PIRG publishes an annual report on toy safety, which has led to more than 150 product recalls and regulatory actions over the past 30 years.