Wild Country appears to have issued a recall on certain batches of Classic Rocks and Anodized Rocks dating back through January, 2010.
more info here:
http://www.wildcountry.com/files/public/Rocks%20Recall/Rocks%20Recall%20Uk%20Final%2007012013%20V5.pdf
apologies if this has already been covered.
stay safe out there.