The wir6cmrgr 1000 ft cat6 riser bulk cable roll gray meets or exceeds all category 6 specifications to ensure reliable gigabit network connections and features a foot marked jacket that makes it easy to tell how much cable is left on the roll and enables you to measure your cable runs to your exact installation requirements this category 6 cable has been tested for cmr riser installations and is ideal for in wall between floor and elevator shaft cable runs where cmr fire rating is requ