HTP America® Alcotec ER4043 alloy aluminum MIG welding wire on a 12", 16 lb. spool. Precision wound wire recommended for use in HTP America Pro Pulse 300 welder (16lb rolls are not recommended for use with Pro Pulse 200 or 220) for single and double pulse welding. Available in the following diameters: .035" and .047". This wire is made in the U.S.A.