Traditionally, pearls were knotted between each pearl to prevent wear, and loss when the silk broke. You can do this by hand, but this knotter tool simplifies it by making it easy to snug the knots up tight to each bead. Make tight, consistent, untwisted knots for the ultimate professional look. Fundamentally the same as the Tri-cord knotter - watch a short how-to video here. About 5.75 inches long. Brief instructions also on back
By the each.