• Compatibility: Compatible with Ender 3, Ender 3 V2, Ender 3 Pro 3D printers, and the CR10 series. • Bi-metal Material: Made with titanium alloy to reduce heat conduction and plated copper for better heat dissipation. • 4.1 Bore Design: The 4.1 mm straight-through bore minimizes the possibility of clogs, ideal for printing flexible filaments. • Compatible Filaments: Suitable for flexible filaments like PLA and ABS, with a printing temperature below 250 ℃. • Specifications: Bore diameter of 4.1 mm, total length of 27 mm, M7 heat end screw, and M6 heating end. • Includes: 2 pieces of 4.1 Bore Bi-metal Heatbreak.