The Evolve D Plus is one of the best-selling dry herb pens from Yocan. It's powered by the 1100mAh Evolve Plus battery, which almost doubles the Evolve D's battery capacity. It has a unique dual coil with twelve wraps of wire to better heating more robust vapor production. The dry herb chamber really sets it apart with its huge capacity. It also has a convenient stainless storage container in the base of the battery.