Ball Chain #10 Spool Nickel Plated Steel 100 Feet #10 Nickel Plated Steel 'B' Couplings are used as a connector for this chain size (sold separately) #10 size chain has a bead diameter of 3/16" (4.8mm); also available in #6 and #3 chain size Shiny chrome-like finish This is a larger more industrial size ball chain Made in USA by Ball Chain Manufacturing Since 1938. We are the manufacturer, not a reseller.