Magnetic field polarity of the N_J = 16 no feedback simulation at t = 1 Gyr with an initial vertical field. We can see field reversals throughout the disk in both the radial and toroidal directions. These are highly correlated to the spiral arm structure, as the reversals form together with the velocity perturbation induced by spiral shocks (Dobbs et al. 2016). The vertical field remains fairly correlated to the density and is similar in strength to the initial setup.