M15 Brazing Rods Are A General Purpose Flux Coated Bronze Alloy Used For Bronze Welding; Brazing Copper; Cast Iron; Steel Sheet And For Light Assembly Work; This Brass Rod Is Fast Flowing And Leaves Minimal Flux Residue; The Fast Flowing Nature Of The Alloy Reduces Heat Input Suitable For Oxy Acetylene Welding. 2.5mm 10 Pack.