Vapefly presents the Firebolt Cotton, a natural cotton solution for easily wicking pre-built coils. The cotton is made entirely of 100% organic Japanese cotton and is free of harmful chemicals. The convenient agleted section is manufactured without acetone or glue. The Vapefly cotton is designed to fit 2.5mm, 3mm, 3.5mm diameter pre-built performance coils. Vapefly Firebolt Cotton is perfect for rebuildable atomizers, rebuildable tank atomizers, bottom feeding atomizer.