XPMC Uses an Anodized Aluminum Body with Heat Sinks to Protect a Chromalox Cartridge Heater. The Unit May Be Ordered with Body Only, with Body + 1 Heat Sink or with 2 Heat Sinks. Each Additional Heat Sink Increases the Maximum Wattage of the Unit. Two Control Thermostats Can Be Used to Tailor the XPMC to Individual Needs. Also the Number of Heat Sinks May Be Adjusted to Suit the Wattage and T‑Rating Needed. Units May Be Ordered in 6" or 12" Lengths From 120v to 480v (12" Model Only)