Wotofo Xfiber Cotton for Profile RDA is made of 100% organic cotton, long fibers wicks smoothly and it is very easy convenient to use . Proper cotton amount and length is very convenient to use, you do not need to DIY. It has a sheath on the end of cotton, which makes it easy to thread the cotton through the coils. It comes with great absorption capability and will provide purest flavor. Get this for your Profile RDA. 10pcs in a pack.