Apex Tool Group LLC based in Sparks MD is one of the largest worldwide producers of industrial hand and power tools tool storage drill chucks chain and electronic soldering products, Solid copper, plated with iron, nickel and chromium precision ground ET series tips , Provide maximum heat transfer from the heater to the tip , IMPORTANT: Use only Weller tips, Use of non-Weller component causes damage to the unit SKU: ORSNO50645