Glass sand, colorized gravel are our hot selling product, polular in Europe and North America market. They are colorful and non-toxic, the color is not dye so it would not fade. They can be used in interior/exterior wall, swimming pool, pond and gardening decoration, also can use as the decorative gravel in fish tank, handcraft accessory etc. We have many colors and sizes for your choose. Welcome to contact us for more detail information.