Organic Cotton Pads for RDA / RBA atomizers are used as wicks in rebuildable tanks for absorbing the ejuice for vaping. This pack of 10 RDA cotton squares are 100% organic and grown in Japan without the use of any pesticides or chemical fertilizers while also unbleached and 100% natural for the best vaping experience with an RDA tank. In past times, it’s not unheard of for someone to use a generic cotton ball as a vape wick, however this organic Japanese cotton will undoubtedly provide you with substantially more flavor and is much easier to use as its pre cut into small squares with 4 thin layers in each sheet. Several individual vape wicks or approximately 20 RDA builds can be made from a single cotton pad. Cotton square typically can last anywhere from 1 week and up to a month depending on how often you change your cotton, flavor or use your vape device in general. Pack of Japanese Organic Cotton details: Includes 10 cotton squares 100% Japanese Grown Organic Cotton Completely natural and unbleached Pesticide and chemical free -1 Cotton pad will last you about 1 week or even a month depending on how often you change your cotton. 1 pad is enough cotton for approximately 20 builds.