Each Glow Necklace is made from 2 glow sticks, made from a tough plastic tube, that contains 2 non-toxic chemicals solutions, 1 in a breakable vial. When mixed together, the 2 chemical create a chemical reaction, which causes the 2 chemicals to glow for up to 6 hours. Each glow necklace comes with 2 connectors, so the glow sticks can be joined together, to make 1 hoop necklace. To activate the glow sticks gently bend until the glass vial inside snaps once, then shake to mix the solutions. Each glow necklace comes with full safety instructions, please read before use. Each glow necklace is CE marked & is not suitable for Children under 5 years. Each glow necklace is priced & sold individually.