I got the same ones, I wanted to make sure there was a magnetic pull through the 4 oz. bottle I put them on. I underestimated them and they did the same thing as you, they snapped around and shattered!
They are strong no doubt, the viscosity of the Lugols changed, the drops got considerably smaller. It was taking 22+ drops instead of the normal 16 drops to fill my capsules. //www.curezone.org/forums/am.asp?i=2033583#i