The types of Chikuzen biwa are Yongenbiwa Instrument (four-stringed) and Gogenbiwa Instrument (five-stringed) that were designed by the first Kyokuo and his biological child, Kyokuso TACHIBANA the first, and this Gogenbiwa Instrument is overall slightly bigger.
筑前琵琶の種類は四弦と、四絃より音域をより豊かにする為に初代旭翁とその実子である橘旭宗一世によって考案された五弦があり、五弦の方が全体にやや大きい。