Each necklace is approximately 32cm long and has a screw clasp. The screw clasp itself is a safety feature. It is the weakest point of the necklace, and will break if undue strain is placed upon it. This is a design feature to protect against choking if the necklace is pulled hard. As an additional safety feature, there is a knot before and after each bead so that in the event of it being broken, there is no risk of choking on the beads.
These necklaces are not for chewing. They are generally worn at night when the child is of teething age.