200 New Ball Chains & Split Rings This new set of 200 ball chains and split rings. These are perfect for making your own key chains. Each is made from nickel plated tempered steel for strength and durability. You receive: 100 Ball chains that each measure approximately 4" (102 mm) long and each ball measures about 2.4 mm (3/32") in diameter 100 Split rings that each measure approximately 24 x 2 mm (15/16" x 1/16")