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