Four natural slate tiles designed for aquarium or reptile use. 

Can be used to make ledges, caves and crevices in your aquarium.  Also ideal as a spawning surface for Angel Fish or Discus.

Ideal as a textured feeding tile for tortoises to help keep their beak down.

Many other uses outside of aquarium & reptiles.  Can be used for painting/drawing, laser engraving, flower pot stands etc.