Description: E10 Welding Head: The E10 soldering tips set will provide you with all the soldering iron accessories you'll need for maximum results. Features: Precision ground copper tips are plated with iron, nickel and chromium, long lasting use life. Easy to use, not easily oxidized. Premuim Quality: Thread soldering tip is finest quality brass materials, not easily oxidized, strong and durable. Suitable For: This USB welding head suitable for usb soldering iron head E10 interface battery soldering iron soldering iron head threaded soldering iron head. Easy to Use: All soldering iron tips can be used, after soldering, there will be tin slag on the soldering iron tip, just wipe it off with this sponge, and the tin slag will fall off. Specification: Material: Brass Size Chart: Length: Approx.50mm/1.97inch Package Includes: 2 Pieces Tip K Soldering Iron Tips 2 Pieces Cleaning Sponges Note: 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.