121110-050 QuickCable 4/0 GA 350 Amp SBF Fusion Contact (50 PCS) - Fusion® connectors come ready-to-use with solder and flux preloaded in the barrel. Made of cast copper and tin plated for added conductivity and corrosion resistance for superior reliability and years of dependable service. Fusion® solder on connections are up to 70% stronger than crimp on connectors and provide a more consistent quality than any other solder method including traditional wire solder and solder slug. Faster and less confusing and more cost effective than multi-component solder slug programs and they are especially good in the presence of destructive vibration or corrosive chemicals.