I had some given to me without the packaging so I don't know exactly what they contained. But they're more of a large pellet, about the size of a wine bottle cork.

Thanks tropicbreeze. I went ahead and ordered some different ones than I usually use. I usually use AgSafe 10-16-10 tabs, but they haven't seemed to do much, so I ordered some Pond Tabs. They had good reviews, even though they didn't contain so much phosphorus.

I use Jobe's Tomato spikes which are little tablets. They are much cheaper than anything marked "pond" You want the high Phosphorus to encourage bloom. Waterlilies are heavy feeders.