This is 5/32" (4mm) diameter ball chain, with 59 balls per foot. Use it to create fantastic designs in your mosaics! When you grout, the connectors between each ball disappear in the grout & you're left with what appears to look more like a line of little, sparkly beads. It's a very fun way to add texture & a whole new look to your artwork! Hover over the 2nd image to see this color used in a completed project.