These new Aspire Nautilus BVC coils are designed for a longer life and still ensure the purest and cleanest taste of all liquids. The new Aspire Nautilus BVC are lower vertical single coils while the original Aspire Nautilus BDC coils are lower double coils. The Aspire Nautilus BVC coils are the latest model of Aspire Nautilus coils. You are the "" Vertical Bottom Coil "design. These are the new Aspire Nautilus BVC coils for use with Nautilus Aspire and Aspire Nautilus Mini.