Vapefly presents the Firebolt Cotton, a natural cotton solution for easily wicking 3mm 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 3mm diameter pre-built performance coils. Vapefly Firebolt Cotton is perfect for rebuildable dripping atomizers (RDA), rebuildable tank atomizers (RTA), rebuildable tank atomizers (RDTA).