This Himalayan Crystal Salt Lamps is believed to create negatively charged ions in the air. This is a good thing because modern day pollution & electrical equipment create positive ions in the air which are potentially harmful to us & cause air quality in areas affected to deteriorate. By using a Himalayan Crystal Salt Lamp you replace the negatively charged ions in the air which help us to avoid the alleged physical & mental harm that the ’electric smog’ creates. Rather than sell them by size we sell them by approximate weight. Items are marked with sizes to give a rough idea of size only. Every lamp is completely unique ! Crafted Salt Lamp - Heart