This is (10) 1 lb rolls of 4043 aluminum mig welding wire. 4″ roll size. Wire size is .030 diameter. Arbor hole is 5/8″. It has a pound of product with the roll weighing extra. 4043 is the softer type of mig welding wire and often requires a spool gun to work properly. All aluminum welding requires 100% Argon gas. Made in Canada.