Quick disassembly and easy replacement at room temperature, simply unscrew the old nozzle by hand and screw in a new nozzle in its position. The new heating elements - Hetercore, which is smaller and faster than traditional heating blocks, has a positive temperature coefficient (PTC) that can reduce power as the heat increases, preventing overheating and combustion. Efficient heat dissipation fan combined with anodized heat dissipation fins for more efficient heat dissipation. Color: As Shown Material: aluminium alloy Package Contents: 1 x -3D Printer Extrusion Head kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.