50 22" Premium Glow Necklaces, Extra Thick 7mm Diameter (Purple) 50 22" long, extra thick 7mm diameter, premium USglow Laboratories brand glow necklaces. Thickest 22" glow necklaces available, resulting in 20% brighter glowing. Single color lot containing purple only. Long, bright glow duration. Guaranteed factory fresh with 2+ year shelf life.