Paracord Planet's ball chains are made from a strong metal alloy and have a higher quality than other plastic or nickel chains. Each necklace comes with a matching ball connector. These necklaces are perfect for dog tags, scrabble tile pendant necklace, bottle cap pendant necklaces and much more! Adjust the necklace with ease to your desired length. Each silver and black ball chain are 4 or 24 inches long, 2.4mm bead size and comes in 5, 10 or 20 pack sizes.