Features: Professional welding pen designed for efficient 18650 battery assembly, featuring auto melting technology to eliminate oxides and deliver clean copper to copper joints without flux. High conductivity copper construction ensures superior heat transfer and durability, while the ergonomic handheld design provides comfort during prolonged welding tasks in workshops or field operations. Ideal for electronics technicians, HVAC specialists, and DIYer enthusiasts working on lithium batteries packs, power systems, or small scale metal fabrication projects. Streamlines battery pack repairs in electronics manufacturing, secure copper pipe joints in refrigeration systems, or assemble power solution for robotics and solar energy applications. Compact yet robust, this copper welding tool simplifies oxidation less bonding for 18650 cells and electrical components, making it indispensable for precise tasks in automotive, industrial, and home based electrical maintenance. Specifications: Component: Copper Size: Approx.1.5x50x3mm/0.05x1.96x0.11inch Package Includes: 10pcs Welding Pen note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.