Takara Tomy's next Beyblade... Beyblade X

The spinning portions were not sharp, but the rings are made of diecast metal and usually they come in layers.  Typically the stadiums back then never had covering, so when they collide with each other or when they spin out of control, they'll fly out.  Since kids played them at home on their carpet and weren't standing but sitting, a few kids probably been hit by a beyblade before.