Features: Brand new and high quality Metal radiators, with slots on all sides to increase aircontacts area, honeycombdesign, lighter weight, better heat dissipation, effectively reducing throat blockage. Using spiralpattern air joints. The entire hot end can be easily removed. Easily replace the nozzle with one hand---- Red heatsink, external cooling fan expansion interfaces. The throat tube is composed of two types of metals. The lower part is made of titaniumalloy material to reduce thermal conductivity, while the upper part is made of coppermaterial for heat dissipation. The throat is in contact with the red radiators to increase the heat dissipation area. It can meet the requirements of engineering plastic printing. Applicable materials includePLA, ABS, PETG, TPUPPC, nylon, as well as composite materials containing wear-resistant additives, such as carbon fiber, steel, wood, boroncarbide, tungstens, and phosphoruss. Style difference: The heating block and nozzle materials are different. Everything else is the same for Model A: the heating block is made of aluminum, and the nozzle is made of brass. The maximumoperating temperature is 300 degrees. Model B: The heating block is copperplated, and the nozzle is copperplated. The maximumoperating temperature is 550 degrees. Specifications: Material: Aluminum alloy Style: Aluminum, CopperPlated (optional) Package Includes: 1 x Red LizardQ1 Radiators note: There may be slight size deviationdue to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.