The Yocan Evolve D Dry Herb Dual Coil Core comes in a pack of 5 replacement coils, which is an excellent fit for the Evolve D vaping pens and atomizers. Made up of high-grade material. The spiral heat generation element of the product is something that makes it all the more worth it. As a very beneficial product, the dual coil core can vaporize any dry herb with equal consistency. It comes 5 per pack .