The Cambodian double-reed instrument pī a, or pey prabauh, has a characteristic cylindrical central bore. The mouthpiece of this woodwind instrument with a double reed is around eight centimetres long and is scraped from the prabauh water plant. The instrument has seven frontal tone holes and a thumb hole between the first and second tone hole. Above the first tone hole is a resonance box that has been reduced in size with wax and covered with cigarette paper. The private collector acquired the piece in 2003 near Angkor Wat from a musician who justified the covers as follows: "It sounds better this way!";