This 3D printer heater block compatible with E3D Volcano. This heater block is for OD 3mm cartridge temperature sensor. Made of high quality copper alloy, machined with very high precision, durable in use and longer service life. The size of the item is Copper has more than 3x 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 your heat-up times, and can provide tighter temperature control. This copper-alloy is very temperature resilient, and will not start to soften or anneal until way beyond 500C, making it perfect for the high-temperature printing. Just make sure your nozzle and HEAT BREAK front end are tight and sealed. Otherwise, the melted consumables will leak along the screw holes. Please confirm the size before purchase. color:silver Package 2pcs Volcano Heater Block