30 Inch Aluminum #3 Ball Chain Necklaces 100 Count Each neck chain includes a matching connector already attached #3 size chain has a bead diameter of 3/32 inch (2.4mm) Aluminum ball chain is lightweight and rustproof #3 ball chain is the common chain size for dog tag necklaces Made in USA by Ball Chain Manufacturing Since 1938. We are the manufacturer, not a reseller.