The salt crystal used in tea light holders comes from salt mines where crystallized salt has been deposited more than 260 million years ago. The warm glow of our salt tea light holders creates a cozy atmosphere and adds a healthy touch to your home, spa & massage centers. Give the GIFT of HEALTH to yourself or loved ones! These are hard ones to keep on our shelves at our store! These tea light holders fit into SO MANY decor styles and are absolutely stunning when lit! (as ALL of our Himalayan Salt Candle Holders and Lamps are!) These Himalayan Salt Carved Candle Holders have either 2 or 4 holes for your tea lights. Approximate weight and sizes: 2-hole weighs 1-4 lbs. and is 4-5" W x 4-6" D but can vary! 4-hole weighs 2-6 lbs. and is 3-6" W x 3-6" D but can vary! As with all of our Himalayan Salt Lamps and Candle Holders this candle holder will produce wonderful Negative Ions when lit. Positively charged ions are produced when too many pollutants, allergens, and dust particles are present along with an electronically charged environment. Electronically charged environments are where multiple electronic items are frequently in use throughout the day. Homes and offices are typically very positively charged. These lamps and candle holders will create negative ions and when they come into contact with the positive ones, they will in essence CANCEL them out!