Overview Reviews Product Description EVANS EQ4 series features a single ply of 10mil film. A fixed internal overtone control ring focuses the tonal response of the drum. The frosted surface provides a warmer tone. Product Videos Custom Field Product Reviews Write a Review Write a Review × EVANS EVANS EQ4 Frosted Bass Drum Head, 20 Inch Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *