Eco Pro Tungstenweights are 97% pure eco friendly tungsten. Fray Free, insert free and lead free,Eco Pro Tungstenweights offer serious advantanges over lead.Eco Pro Tungstencast farther and moreaccurately than lead. Actually feel what you have been missing! Smaller, dense tungsten is super sensitive, allowing you to detect more strikes and catches more fish while greatly reducing hang ups! Special “seal coat” painting resists chips and scratches.