Features: Protect the heat break from external force; hollow-carved design increases air circulation without obstacle Easy installation, one-hand nozzle replacement without grasping the hotend High quality bimetal material,reduces heat upward conduction at the heating position, and copper for heat dissipation to accelerate heat conduction Fit for Ender3 CR10 Voron 3D printer, for all filaments,from basic PLAs to custom medical-grade PAEKs Excellent precision production,make sure the nozzle is smooth without burr, the filament running smoother. Specifications: Name:Full Set Of Hot-end Extruder J-head Material: Full Metal Color: Red / Blue Applicable Model: For Ender3 CR10 Voron 3D printer Size: approx 66.3x23mm/2.6x0.9in Weight: 50g Package Includes: 1 X Extruder Kit note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 1cm errors due to manual measurement.