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. For SAMPLE ORDERS - Order affordable samples before you place an actual full order. Samples are usually 4inch x 4inch or 6inch x 6inch based on the type of tile. These samples are just a representation of the actual tiles for you to see the color and texture of the tiles. Samples are shipped by Fedex / USPS ground service, sometimes the samples are not in good shape on delivery as they are individually packed and lack the proper safe packaging as the actual tile order. Nevertheless they solve the purpose of showing you the color, texture and the pattern of the tiles.