Sold in pairs. These caps are design to fit on the end of a 510 vape pen battery. The use of the caps will prevent damage, shield from dirt, debris, and accidental connection. Also give your batteries a trendy, cool added look. Black in color. Made from vinyl and are flexible, durable, and reusable. All of my products are made and shipped from the USA. I offer free shipping to the United States. Batteries shown in picture are not included.