[Bimetal heating]: 1. It is composed of two materials with different thermal conductivity, divided into 2 parts, the front part of M6 is made of titanium alloy TC4, in order to reduce the thermal conductivity, it is set in the heater and cooler with heat insulation sex. The rear of the M6 uses copper to help dissipate heat for faster heat . [Upgraded Design]Made of two parts copper and titanium TC4. Titanium TC4 can reduce heat conduction upwards when heating parts, and copper is used for heat dissipation to accelerate heat conduction. There is a D7mm sidewall between the neck and the threaded section for more stable holding of the radiator and nozzle; two cutouts in the sidewall allow you to use a 6mm wrench to remove the heat from the heater block. Product name: Upgraded version of high temperature resistant M6 thread titanium alloy bimetallic hose High temperature and corrosion resistance, inner wall, suitable for 1.75mm consumables, suitable for V6 3D printer, suitable for V6 HOTEND heating block Material:Titanium alloy + colour:copper Package Contents: 2 x M6 Nozzle Thread Titanium Alloy Bimetallic Throat Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.