Bass Drum, Powerstroke 3, Black Dot Coated, 22". The Powerstroke 3 Coated Bottom Black Dot Series consists of a single layer sheet, a 10mil coated layer and a 10mil inlay on the outside of the head to subtly dampen unwanted overtones. for midrange and low resonance and increased durability The added 5mil black dot in the center of the head provides deeper bass and a focused attack, created by inspiring legendary drummer Steve Smith.