- Cutting Nozzles Are Manufactured From High Grade Tellurium Copper. -They are of Solid, One Piece Construction, Mandrel Swaged to Create the Optimum Flame Conditions. - Unique Mandrel Swaging Process Produces Smooth, Accurate Gas Passages Providing The Best - --- Conditions For High Velocity Acetylene Gas Delivering Enhanced Stability And Efficiency. - The Seats Are “Diamond” Turned to Guarantee - The Required “Metal To Metal” Seating Required For Backfire Resistance