Reef Life Engineered Reef Structures are engineered reef systems which allow incubation sites and protection for different fish, algae, minerals, and other marine plants and species. The biocompatible surface textures utilize coral mineral matrix substrate ingredients which are perfect agents to promote coral spawn from attaching and growing. Using Reef Life Habitats a underwater forest or farm can be created in the configuration which bets suits the reef site or farm community. Help reforest or oceans by growing your own reefs and creating beautiful diving sites by using Reef Life modules to grow plants and attract fish. This set includes 16 8"x8"x44" pieces which can be layered in multiple designs. Each piece weighs 100 pounds.