Geometro is crated entirely from recycled glass that is ground to fine powder and molded under extreme pressure and heat. colored with inert natural minerals and enamel, it is a full body product immune from fading or discoloration, showing equal color through and through. Tested for hardness and scoring a Mohs hardness rating of 5.5, excellent resistance to UV, common household chemicals, foot traffic, stains, and frost while delivering a slip resistance of R9, it is an excellent choice for both vertical and horizontal surfaces, both indoors and outdoors as well as fully submerged pools and spas.