1PREMIUM MATERIAL: Alloy material is high temperature resistance, slow thermal conductivity, can be constant heating block temperature, while reducing the expansion of consumables in advance caused by the blockage. Copper material can quickly dissipate the heat generated to provide excellent heat dissipation. 2TWO PARTS: 3D printer heatbreak has two components with different thermal conductivity composed of two parts, using a special process to keep them firmly together, no need to worry about it breaking. 3FINE WORKMANSHIP: Extruder all metal throat pipe is made of fine workmanship, CNC fine machining, slick and burr free appearance, clear threads. 4SUPERIOR PERFORMANCE: Upgrade your printer for improved performance. Enjoy smoother printing and achieve better results with these 3D printer parts. 54PCS KIT: The package includes a total of 4 pieces of 3D printer heatbreak, enough quantity to meet your actual use needs. Practical 3D printer accessories.