Rock Salt Double Tea Light Holder from Serenity. Bring the health benefits of Himalayan Rock Salt to your home with this 100% natural Double tealight holder. Himalayan salt emits a stream of negative ions into the air, acting as a natural air purifier. Other reported health benefits include: - Improved sleep - Elevated mood and happiness - Reduction to electromagnetism emitted from appliances, computers and mobile phones - Immune system boost - Reduced stress - Increased energy levels - Reduction in symptoms of asthma and allergies - Dehumidification properties reduces air born pathogens