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