BLACK tips have an additional protected surface, which makes them more resistant to oxidation (rusting) and conducts heat better manufacturer AOYUE / ZHAOXIN suitable for AOYUE / PT / ZHAOXIN / WEP / REPRO / YIHUA stations and other similar construction: 936, 937, 937+, 909, 968, 853k, 803, 738, 768, 868d, 898d, 936a, 936d, 852a, 852d https://elecena.pl/product/22606721/900m-t-4cf-cut-black-soldering-iron-tip 2023-02-22 https://elecena.pl/product/22606721/900m-t-4cf-cut-black-soldering-iron-tip 2025-10-29