Coirgro© Coco coir Cube is made with biodegradable coco, compressed in a block shape, and wrapped with breathable mesh fabric. It is designed with a circular opening at the top for easy watering and drainage, allowing for minimal mess. Excellent and convenient for use to plant clones, seedlings, and young plants. Young roots can penetrate through, receiving oxygen all around. 100% organic, full of micronutrients, ready to use, free from pesticides and heavy metals. This product size is a 4-inch cube (also available in 6-in).