Careful evaluation goes into any prospective materials that might be used in the manufacturing of our 100% Recycled Content Green Leaf Brick products. Many potential waste stream products have been reviewed, but few meet all Green Leaf Brick criteria. To be considered for composition in a Green Leaf Brick, materials need to have close proximity, be readily available, possess excellent ceramic properties, and meet our safety in handling criteria - all while contributing to our aesthetic focus. To date over 25 different recycled raw materials have been approved for use in these brick. There are both foundational materials (those used in every Green Leaf Brick which make up the core of the brick, providing the desired recycled contents and giving the brick its outstanding ceramic properties), and the aesthetic materials (those used to affect the color or texture of the brick).