Compatible with Swiss CR10S PRO Hotend, CR10 Hotend, Ender 3 series, Ender5 series 3D Printer We upgrade this block design with extra ID3.1mmx7mm hole which make this block can be used both with thermistor and 3mm OD cartridge sensor, which supports higher temperature printing sensor like PT100. Heat block is made from Copper Alloy material, Copper has more than 3x the thermal conductivity of brass, and the copper alloy we use has been hardened and treated to reduce the oxidation that occurs in copper at high temperatures. The higher thermal conductivity will also slightly increase your heat-up times, and can provide tighter temperature control. This copper-alloy is very temperature resistence, and will not start to soften or anneal until way beyond 500C, making it perfect for the high-temperature printing that other block can't handle. Its surface is nickel plating, can perfectly protect the surface from rusty, have longer lifetime Package: 1piece plated copper heater block (20x20x10mm)