The fake BeyBlades have writing on them from the Far East. But there is a bit of English on them which says the toys are suitable for children aged three and above, but this isn't right.
Toymakers Hasbro says it recommends BeyBlades for kids of eight and above.
Proper BeyBlades should cost around £5.99 each, but the copies are being sold for about £2.50 each.
Safety experts said parents and children should be on the look out for the fakes, and needed to be warned of the possible dangers.