Ball Chain #3 Spool Stainless Steel 100 Feet #3 stainless steel connectors sold separately #3 size chain has a bead diameter of 3/32" (2.4mm), the preferred chain size for dog tags Rustproof T304 Grade Stainless Steel #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.