Amber Extenders - elegant design and superb quality. Have your necklace or bracelet grow with your child. For parents who want to extend the life of their baby's teething necklace or bracelet. Easy to Fasten with a Twist-in Screw Clasp. Simply screw the ends of the amber baby extender with the existing matching screw clasps on your teething baby necklace or bracelet. Safety knotted between each bead.