• Constructed From High-Density EPS (Expanded Polystyrene) Foam • Can Be Installed With Any Shower Base • Can Be Easily Waterproofed Using PROVA-MAT® Waterproofing Membrane, Features A Dovetail Recess For Better Mortar Adhesion • Easily Cut To Desired Length Or Add Additional Curbs • Lightweight And Durable • Premium Polymer-Modified Thinset Mortar Required For Installation (Premixed Mortar Or Mastic Are Not To Be Used) • Mfg #TT8012CRB60