Ball Chain #3 Spool Aluminum 100 Feet #3 Aluminum Connectors are used as an attachment for this item and are sold separately #3 size chain has a bead diameter of 3/32" (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.