This is an All Metal Hotend Kit for CR10 PRO Printers. This is a drop in All Metal Conversion kit for the CR-10s Pro printers. It requires absolutely zero modification to your printer to install. Our uniquely designed cooling block eliminates need for a thermal tube. By not having a separate thermal tube inside the cooling block, it allows for faster heat dissipation. The thermal heat break is made from Grade 5 Titanium Alloy to provide excellent thermal isolation between the heater and the cooling block. Titanium is extremely strong material and offers almost 3x lower thermal conductivity than stainless steel, creating more defined meltzone. CNC Machined and Assembled in USA