1. Multi-layer electroplating + oxidation resistance treatment, anti-corrosion, anti-sn climbing 2. Good conductivity and electrolytic performance, oxygen-free copper substrate can improve thermal conductivity 3. Lead-free and environmentally friendly, fast heating and longer life 4. Application range of sharp nozzle: suitable for fine welding, or the situation where the welding space is small, and can also correct the tin bridge generated when welding chips 5. The 5-in-1 set includes models: 900M-T-2.4D 900M-T-3C 900M-T-I 900M-T-SI 900M-T-K