Each of these weighs approx. half a pound. And they are about the size of a fist. 
In the realm of spirituality, black tourmaline is highly regarded as a potent grounding stone. It is thought to connect one's energy to the Earth, allowing for a deep sense of stability and security. An incredible gemstone for the Root Chakra. 
The Black Tourmaline crystal meaning is connected to its black color. Because of its dark coloration, this stone has a strong energy and an ability to absorb negative energy without compromising its own energy. Because it can absorb negativity, it can both protect and cleanse you and your environment. Also a very strong EMF protector (Electromagnetic Frequencies).