Thermal heat break is made from Titanium Alloy to provide excellent thermal isolation between heater and cooling block. Super smooth hole for the filament input, much more better than the normal cheap stainless ones. Package: 2pcs titanium alloy heatbreaks PLS CHECK THE DRAWINGS BEFORE ORDERING If there is any problem, please feel free to message us, we will try out utmost to support you. Total Length of heatbreak: 23mm; Material: titanium TC4 alloy; package: 2pieces titanium heatbreak.