Looking for something that hits harder then your standard dual quartz coils? Then the Evolve Plus XL Concentrate Pen may be the one for you. With its quad quartz coils and upgraded battery the XL has one of the largest coils on the market and produces the largest clouds! It also comes with a removable silicone container for your concentrates, full airflow control (no more plugged coils), a magnetic top for easy access to the coil, and a micro USB charging port in the side of the battery. In addition we offer a 2 month limited warranty on the battery.