Features High Hardness and Wear Resistance: The material of the printer throat is bi metal, which has higher hardness and more wear resistance than ordinary throats. Special Processed: The printer heartbreak is treated with special process, the interior and surfaces are smoothly and free of burrs. Small Resistance: Compared with the ordinary throat, the resistance of this bi metal throat to print back is reduced by 90%, which make the printing more precise and delicate. Strong Thermal Barrier Ability: The front end of this 3D printer throat is made of titanium alloy, and the rear end is made of copper alloy, this printer throat has strong thermal barrier ability. M6 and M7 Thread: The front and rear threads of this 3D printer heatbreak throat are M6, M7, the size is standard, can fit the printer perfectly. Specification: Item Type: Bi Metal Throat Material: Titanium alloy, copper alloy Thread Size: M6, M7 High Temperature Resistance: 450-500℃ Package List: 5 x Bi Metal Throat Note: Please allow 1‑2cm error due to different measurement method. Thanks for your understanding. Package List 5 x Bi Metal Throat