The Grodan Pargro Biggie 6" x 6" x 6" Cube is a pack of six rockwool/stonewool cubes designed for optimal drainage in hydroponic gardening. Made with stone wool material from Canada, these cubes offer a convenient and efficient way to grow plants in a controlled environment. The brand, Pargro, ensures quality and reliability in these growing media cubes, making them a popular choice for those looking to set up their own hydroponic system. With a height and length of 6 inches, these cubes provide ample space for plant roots to grow and thrive.