Single 3m length ball chain, copper, #3 size, 10 matching connectors included. Ball diameter: 3/32 inch (2.42mm). Great for many uses, including dog tag chain, key chains, necklace chain, and more. Made in the USA by Ball Chain Manufacturing (BCM) in Mount Vernon, New York. BCM is ISO 9001:2008 certified by the International Organisation for Standardisation. BCM is also recognised by the Green Business Bureau as a Certified Green Business. BCM is the largest manufacturer of Ball Chain in the world and the only major manufacturer of ball chain in the United States.