Rhythm Band BongosIdeal for children in grades K-3, this set of bongo drums features a durable construction with both the shells and the heads. The height of these drums is 4-1/2" and the head sizes are 5" and 4-1/4".. Rhythm Band Bongos Ideal for children in grades K-3, this set of bongo drums features a durable construction with both the shells and the heads. The height of these drums is 4-1/2" and the head sizes are 5" and 4-1/4".