Use this shaft for your sling gun and you wont have to worry about functionality or aging. It is made with 17-4PH Tahitian tempered stainless steel, which is durable, prevents corrosion and is lightweight to reduce drag. One upper embedded barb.Materials: 17-4PH tempered stainless steelDiameter: 6mm.Barbs: One upper embeddedWarranty: Two year limited