CalStar Pavers are made with fly ash, a byproduct of electric power generation, using a manufacturing process that eliminates the need for firing or cement. The result is a sustainable hardscape solution that matches the performance and price of traditional pavers. The pavers contain 40% post-industrial recycled material and produce 85% less CO2 than cement or clay products. They come in 7 colors, smooth or tumbled textures, and with freeze-thaw and de-icing salt resistance.