This Himalayan salt crystal lamp is said to create negative ions in the air which is a good thing as modern pollution and electrical equipment creates positive ions in the air which are potentially harmful and lead to deterioration of air quality in affected areas. By using a Himalayan salt crystal lamp, you replace the negatively charged ions in the air, helping us avoid the alleged physical and mental harm that "electric smog" creates.Rather than selling them by size, we sell them based on approximate weight. Items are marked with sizes to give an approximate idea of ​​size only. Each lamp is completely unique!