Premium Quality 9" to 11" Natural Himalayan Salt Lamps on Wood Base with Cords and Light Bulbs Completely Natural Ionic Air Purifier 14 to 17 lbs average per lamp crafting stones They are tumbled naturally due R NM BLA 6lbs They are tumbled naturally due to the environment and have not been processed by man in any way other than to mine and collect the stones Bismuth helps one to adapt to new surroundings or circumstances by promoting calmness even under stress or pressure and once lit up it emminates a warm and serene amber orange colored glow since you can keep the lamp lit for as long as you like to maintain the purifying effect for as long as you need