• Material: copper alloy; it is machined with very high precision and quality. • Copper has over 3 times the thermal conductivity of brass, and the copper alloy we use has been hardened and treated to reduce the oxidation that occurs in copper at high temperatures. The higher thermal conductivity will also slightly increase heating times and may provide tighter temperature control. • This heating block is for 3 mm OD cartridge temperature sensor. • This copper alloy is very temperature resistant, and will not begin to soften or anneal until well over 500 °C, making it perfect for high temperature printing. • Dimensions (Length x Width x Height cm, Weight g): 2.3 x 1.6 x 1.1, 30