Landscaping , Art deco aquariums terrarians etc
All weights and maesurements are Approximate
Contains sharp edges
Handle carefully or lightly sand edges with fingernail file.
First pictures are taken dry
last ones are wet to show how they look in a aquarium with water
You can also soak in Vinegar 24 hours then use a soft bristle brush to remove more of the outside grit
Careful edges are sharp use fine grit sandpaper around edges or nail file