Yamaha Band and Orchestra 18x14 8200 Series Field Corp Series Bass Drums Easy consistent tuning These bass drums also feature a 5.4 mm steel tension rod to provide easy, consistent tuning without unnecessary weight.Lug casing developed strictly for marching drums The toms and bass drums are both equipped with the first lug casing in Yamaha history developed strictly for marching drums, making Yamaha drums lighter than any competition level drums on the market and ideal for high school, college and drum corps use.