Synthetic River Rock - Decorative Black Obsidian Faux Indoor Landscaping Stones (Approx. 1.5" to 2.5" Diameter Flat Black Chips) by Thor Decor - Made in the USA (2 lb) Thor Decor River Rocks are proudly made in the USA using recycled poly product. These decorative plastic landscaping rocks are a lightweight alternative to real stones. River Rocks are designed for use in plant containers and landscaping projects. They do not stir up dust, dirt, or allergens, making them an ideal alternative to dry, fibrous dressings. Their clean, decorative design will not add unsightly dirt or debris to your decor. Thor Decor River Rocks are a perfect choice for small to mediam planters and are similar in shape to skipping stones. Plastic River Rocks decrease weight stress placed on planting containers and allow for hassle-free soil sampling. River Rocks flat design work well when light surface coverage is needed.