Pro 120 soldering tips match any job and easily snap in and out of Pro 120 butane-powered soldering irons. Pro tips are iron-chrome plated to withstand long periods of soldering time. More specifically, the copper shell is iron plated to resist erosion, chrome plated to resist corrosion and tinned to provide efficient heat transfer. These processes provide maximum tip life for extended usages. This tip is not usable in Pro 50 or Pro 70 butane soldering irons.WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov