This is a slap ramp compatible with the current Yamaha BB series. We can make them for both 4-string and 5-string basses, so please contact us individually (^^) We can also make them to fit the old BB series, so please consult with us beforehand. It has a recess to avoid the truss rod hole, so you can attach it directly with the included double-sided tape. We also sell finger ramps, and there is a discount if you purchase them at the same time, so please consider it.