Elastic Cord: This is a must have when working with children to string beads for jewelry. You don't have to be overly concerned with the length you are stringing, since it is just tied in the back and stretches open to go over their head when you're done. This elastic cord is about 1mm in diameter in a translucent white color. It comes on a spool of 25 yards. It's a good and strong cord, but it is recommended that you completely cover the knot with a spot of glue, or the elasticity itself will cause the knot to eventually come untied.