Travertine, but without the travertine hassle, no sealing, no special PH cleaner! These tiles replicate the natural beauty and appeal of grey travertine. The gloss finish helps define the subtle yet rich travertine veins, while remaining light and reflective to create the illusion of space. What makes these tiles different is the material. These tiles are porcelain making them more robust to be used anywhere throughout the hole including the floor.