Features: *These tips are made from copper and not electroplated, easy to tin and diamagnetic, suitable for lower temperature soldering. *Don't leave your iron running for hours and hours if you are not using it. This can make the tip get black oxide cover. *Try to tin the tip as it heats. If you leave it on too long or run it too hot it will burn off the solder and go black again. *Type C: Use the beveled part of the front end of the soldering iron tip for soldering, which is suitable for soldering that requires a large amount of tin. 5C type soldering iron tip, suitable for welding occasions that require large heat such as thick terminals, circuit boards, power supply parts, etc. Specification: Product name: Soldering Iron Tip Material: Copper Color: Copper Model: 900M-T-5C Length: (Approx.) 42mm Working length: (Approx.) 15.5mm Inner diameter: (Approx.) 4.5-4.7mm Outer diameter: (Approx.) 6.4mm Suitable for: welding occasions that require large heat such as thick terminals, circuit boards, power supply parts, etc. Quantity: 5Pcs Package Included: 5 Soldering Iron Tips 900M-T-5C Note: 1. Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.