Ball Chain #3 Connectors Yellow Brass 100 Count Attachment for #3 Yellow Brass and #3 Brass Plated Steel ball chains (sold separately) Also available: #6 Yellow Brass Connectors, #10 Yellow Brass 'B' Couplings Bulk Packed #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.