Features: 1. Metal bar: fine craft and enhanced functions, support not only electricity conduction, but also heat conduction, solving the heat problem after using for a long time. 2. Buckle: integrated insertion design. Just gently press the buckle to easily remove and replace the heating ring and nozzle. 3. Pen tip: the temperature of the printing pen tip is only 70-80degC, which will not cause a scald. Aviation non-metallic materials, high-temperature resistant and more assured to use. 4. Method to change the nozzle: in order to prevent damage to the nozzle buckle, two small screwdrivers are required to be inserted into the card slot at an oblique 45degree as shown in the figure, and the pen tip will fall off with a slight push. 5. Built to strict quality control standards, design improved for more durability. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Specification: Material: plasticmetal Size: 2*3cm Color: black Package List: 1 x Replacement pen head for 3D printing pen3D printing pen is not included