2kg of river pebbles.
Each pebbles is between 6-10cm.
Sterilised and safe to go straight in any indoor or outdoor enclosure. Perfect to use for any small or medium sized species. Keeping nails trim, keeping water cleaner and making climbing area's are just a few uses for this cheap versatile product. 
Can be reused over and over with just a rinse off in warm water should they get dirty.
These are a completely natural aggregate so shape, size and colour will vary massively between pebbles.