PWZ1005: Features: -Aquarium substrate. -Available in River pebbles and Salt / Pepper colors. -Natural gravel. -100% Acrylic coating. -Will not alter the chemistry of your aquarium water. -Non toxic. -Colorfast. -Package 6 / 5 lbs bags per case. -Made in United States. Recommended Use: -Fresh and saltwater aquariums, ponds, terrariums, gardens, potted plants, vases, ash trays, crafts and hobbies, architectural surfaces and landscaping designs. Specifications: -Grain size: 6.3-12.7mm. -Dimensions: 13 H x 8 W x 2 D.