Made of 100% natural 129A organic cotton, the Advken Doctor Coil Preloaded Cotton is a high-quality organic cotton for coil building. It is has long fiber, which is easy to wick and can make superior absorption. With a resealable bucket box, the Advken Doctor Coil Preloaded Cotton can be kept in good condition. Best choice for DIY lovers. Just get one to enjoy a more superior vape.