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Semperfli Lead Wire Natural Lead Wire Natural is a round high-grade lead wire that comes on a spool which is part of the Semperfli Lead Wire Natural range. It can be used extensively to weigh down flies, making ribs, especially nymphs. Lead wire should be treated with caution as lead is known to cause birth defects or other reproductive harm and cancer. Exposure to lead during pregnancy can affect brain development and cause learning and behavior problems for the child. Because of this and to adhere to USA legislation, particularly in California, each spool carries a Proposition 65 warning. We recommend using protective gloves when using or winding lead wire onto flies if you are tying lots of flies. 0.3mm Lead Wire Natural Specifications Manufacturer Part No: SLPB003NAT Width In 0.012 inch Width In 0.3mm Actual Length (Imperial) 5.46 Actual Length (Metres) 5 0.4mm Lead Wire Natural Specifications Manufacturer Part No: SLPB004NAT Width In 0.012 inch Width In 0.3mm Actual Length (Imperial) 4.37 Actual Length (Metres) 4 0.5mm Lead Wire Natural Specifications Manufacturer Part No: SLPB005NAT Width In 0.02 inch Width In 0.5mm Actual Length (Imperial) 3.27 Actual Length (Metres) 3 0.6mm Lead Wire Natural Specifications Manufacturer Part No: SLPB006NAT Width In 0.028 inch Width In 0.7mm Actual Length (Imperial) 3.06 Actual Length (Metres) 2.8