Features: These ceramic feed port protectors prevent material jams and nozzle damage with premium heat resistant construction. Ceramic adapter feature easy installation and withstanding prolonged temperature for consistent extrusion. Perfect for 3D printing enthusiasts and professionals requiring enhances printer component protective during intensive fabrication processes. Maintain flowing stability in printing environment like rapid prototyping and model creation workshops. Ceramic guards extend extruder life by reducing abrasive wear from continuous feeding operations. Specifications: Component:Plastic+ Ceramic Size:Approx.25x16x10mm/0.98x0.63x0.39inch Package Includes: 4Pcs Ceramic adapter Protector note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.