Feature: 1. 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 2. Special Processed: The printer heartbreak is treated with special process, the interior and surfaces are smoothly and free of burrs 3. Small Resistance: Compared with the ordinary throat, the resistance of this throat to print back is reduced by 90%, which make the printing more precise and delicate 4. Strong Thermal Barrier Ability: The front end is made of titanium alloy, and the rear end is made of copper alloy, this printer throat has strong thermal barrier ability 5. M6 and M7 Thread: The front and rear threads of this 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.