Carson Home 21 inch sonnet chimes have 4 heavy walled, center pinned tubes that emit sweet gentle tones. They are made of an all aluminum construction, durable powder coated and anodized finish, and strung with industrial cord. Each chime has an adjustable striker. Tubes are 3/4 inch diameter, sentiment is printed directly onto the tubes. Each Chime Tube Reads: “Amazing Grace how sweet the sound” Measures 21″ in length and 3.75″ in diameter.