New unused bag, they sell for about 10 bucks in store.
Here's the description:
Dust-free and epoxy-coated gravel safe for aquarium water
*Provides optimum surface for beneficial bacteria colonization
*Helps maintain clear and healthy water
*For fresh and saltwater aquariums
Create a colourful aquascape in your aquarium with Marina Decorative Gravel. The gravel is epoxy-coated, which makes the gravel inert and prevents any adverse effects on water chemistry. Research shows that epoxy-coated gravel provides an optimum surface for the colonization of beneficial bacteria, which in turn provide biological filtration for clear and healthy water. The gravel is dust free . For fresh water and saltwater aquariums.