Made from 100% natural salt crystal, our lamps are hand-carved, and each lamp is unique. They are believed to have benefits for improving our well-being thanks to the negative ions the lamp generates: purifies the air by reducing dust, pollen, and other contaminants from our ambient air. Do not put the lamp/candle holder in contact with water. Place it in a dry and well-ventilated room, on a flat, non-slip surface that is not sensitive to moisture, and on a protective underlay to prevent any damage to the salt. Dimensions: - Moon Lamp: 9 to 12cm (d) x 7 to 12cm (h) - 4 Massage Balls Lamp: 12 to 14cm (lamp h) / 4.5cm (massage ball d) - 2 to 3Kg Lamp: 10 to 14cm (d) x 17 to 23cm (h) - 4 to 6Kg Lamp: 14 to 19cm (d) x 23 to 29cm (h) - USB Rock Lamp: 7cm (L) x 7cm (W) x 12cm (h) - USB Round Lamp: 8cm (d) x 8cm (h) - 500g Candle Holder: 5 to 8cm (d) x 6 to 8cm (h) - 1Kg Candle Holder: 8 to 12cm (d) x 7 to 11cm (h) - 900g Candle Holder: 9cm (d) x 8cm (h)