- Proper tinning and temperature control improve solder flow and tip life. Tin the tip during heating; leaving it in molten solder too long or using too high a temperature can cause the solder to burn and the tip to blacken. - Protect tip longevity by avoiding prolonged idle operation. Do not let the iron run for hours when not in use, as this can cause the tip to darken. - Compatibility and selection. These soldering iron tips are designed for soldering stations; you can choose the right tip for your soldering needs. - Color variation note. Due to monitor differences, the item color may vary slightly; please allow a small color difference. Use scenarios - Repairing PCB boards with through-hole components or surface mount parts, where proper tinning and temperature control yield cleaner joints. - Precision work on small components or fine pitches, by selecting the appropriate tip and maintaining controlled heat. - Regular maintenance or rework tasks that require reliable tip performance and easy tip selection.