Product review (3 stars): Thin bones melt quickly
Cute at the time I take them out of the mold, but see below...

Its just the silicon with no shell so care needed to keep it from spilling in the freezer.

The fish bones are narrow and melt easily, so the cute idea of 'put dead fish in peoples drink' doesnt really work since the thing melts into just a head that looks like a normal cube by the time I get from the kitchen to the table.

I haven't tried, but I assume you could pre-chill the drink so the ice melts slower, but umm.. for me the whole point of ice is to chill the drink, so the fast disintegration from room temperature drink sort of ruined the fun.