This set of 4 Schluter Systems Ditra-Heat heating membranes (Model# DH5MA) each measure 31.5" wide x 38.63" long x 0.25" thick, providing 8.4 sq ft per sheet and a total coverage of 33.6 sq ft. Ditra-Heat membrane serves as both an uncoupling layer and a substrate for electric floor heating cables, making it ideal for tile and stone floor installations in bathrooms, kitchens, and entryways. Like new in original packaging with no damage or missing parts.