Wotofo Xfiber Cotton for Profile is made of 100% organic cotton, long fibers make wick smoothly and it is not easy to pull-apart. 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. 10pcs in a pack.