This listing is for a 1.5mm ball chain. I ordered the 20" length. It is beautiful. It holds my pendant and looks lovely. it is not a military grade ball chain which is probably a 2mm or a 2.5mm ball chain. I love the Lobster clasp. If you are a woman looking for a chain for your pendant- you are in the right place- if you are a guy looking for something to hold your bling or dog tags look for a 2mm-2.5mm chain with key words Military or dog tags.