This is a k-type thermocouple wire with yellow PVC insulation, which is good up to about 105 C or 221 F. This k-type thermocouple wire can be used to make your own thermocouples for a wide range of applications, or to make your own extension wire. The chromel alumel wire is made to standard thermocouple specifications. It is sold in 110 yard (330 ft) rolls, so if you order 2 units of this, you will receive 2 rolls, each 110 yard long. Look for a different listing to find this in 10 yard, 50 yard, 220 yard or 330 yard rolls.