50 LB, Premium, Polymer Modified Dry Set Mortar, Designed For Thin-Set Or Medium Bed Application Up To .75" Tiles Measuring 15" Or Larger On 1 Or More Sides, Made Of Natural Stone, Ceramic, Quarry, Cement Body, Clay Pavers, Brick, Stone Veneer, Cement Based Precast Terrazzo, Non-Slumping Formula Immediately Holds Tiles Reducing Installation Time By Eliminating Lippage & Minimizing The Need For Additional Leveling, Exceeds ANSI A118.4 & A118.11 Standards Without The Need For Additives, Formerly Known As Marble, Granite, & Travertine Premium Mortar.