Question about PowerBlock Dumbbells

Hello there,

my question is about the ProSeries as shown on PowerBlock's website.

Under the price for the pair there is a helath warning which is connected to a link. On that page it is explained why PowerBlock had to add this specific health warning. I am not sure what to make of this, to be honest. What actions exactly does the warning refer to? Does it mean, if I touch the dumbbell then I am exposed to a potentially dangerous substance?

I had seen this warning quite some time ago and had been concerned ever since. If anyone understands this warning and could explain, it would be much appreciated.