PT-25 PT-30 2.40mm Aluminum Enameled Transformer Winding Wire means that the one spool of winding wire is about 25kg or 30kg. Conical magnet wire delivery spool is made of plastic materials, used for below 5kg. The tapered design not only maximizes the winding volume of the spool, but also ensures the smooth winding process. But the 25kg and 30kg aluminum enameled transformer winding wire normally uses the wooden rool. All product data may have slight deviations, and the tolerance values ??are within the range of industry standards. The packaging and transportation process of the tapered magnet wire conveyor spool has the characteristics of high strength, strong impact resistance, and good balance.