The Flux Core Conversion Kit contains a 2 lb spool of.035in. flux core wire a 10 pack of.035 contact tips, and cable liner. This kit can be used with the Mig-Pak 10 (19071) and the Mig-Pak 15 (19069) for welding heavier gauge metals. Note:.035 is the diameter of the wire in decimal form or about 1/32nd inch.