Material: Copper Aluminum, Size: 7.8cm long, iron/copper/aluminum/stainless steel can be welded, and it can be melted with a lighter. It is recommended to cool and solidify for 5 minutes after welding. VERSATILE: Our low temperature welding rods are perfect for a variety of welding projects and can be used on copper, iron, aluminum, stainless steel, water tanks and PVC pipes. (The material is weak, maybe the goods are crack, but does not affect use.) HIGH STRENGTH: Our welding rods provide a high strength that is perfect for a range of applications, welding work on circuit boards, electronic equipment, etc. EASY TO USE: Our welding rods has great solderability, insulation resistance,easy to use and perfect for beginners or professionals alike. LOW TEMPERATURE: Our welding rods work at a low temperature, making them great for welding applications that require a lower heat. DURABLE: Each welding rod is manufactured with high quality materials tin powder to ensure durability and longevity, high fineness, fast welding, no peculiar smell.