The roller mat is made of durable stainless steel rods with flexible rubber edging allows for easy rolling motion to lay out, or roll up for storage. The roller mat has extreme resistance to heat making this ideal for use under hot pots and pans, or as a drainer for wet dishes. It is designed to conveniently suit our Cuisine fireclay sinks (see list below for compatible sinks for this colander size) when installed inset or undermount with a semi-reveal installation.