The Themar Series is a rectified glazed porcelain. Digital print technology creates some of the same characteristics as some of the most sought-after natural stones including marble. Because this material is a porcelain product maintenance risks involved with actual stone are eliminated. There is a size difference between the matte and polished version of the 18"x36" as well as the 36"x36". There will be noticeable variations in color and movement between pieces. Therefore it is important and recommended that a range of this product be viewed before finalizing a purchase. Piece to piece variation in shade or color are inherent in all fired clay products therefore it is recommended to mix tiles from several boxes at a time during installation to achieve the best range of color. This series is suitable for residential and commercial applications. For proper bonding LHT/LFT mortar for large format and heavy tiles should be used when installing tiles with a dimensional length greater than 15" and rectangular shape and plank tile per industry standards. Proper thinset coverage is also necessary and in some cases back buttering of tile may be required.