Concrete Gray Engineered Marble: Contemporary Elegance and Understated Luxury. Thickness: 3/4” Perfect for Bathrooms, Backsplashes, Jambs, Window Sills, and Floor Transitions. For Custom size by any side an length please visit the product listing B0CWLTJD4P Shop online for our Concrete Gray Engineered Marble Threshold, designed for Schluter Kerdi Board and Tile Redi Shower Pan Systems. Crafted from premium engineered marble and polished to perfection, this stylish piece offers both functionality and sophistication. Upgrade your shower space today!