This product features colorful metal bars with matching color plastic resonator tubes that share the same color template as the Boomwhackers tuned percussion tubes. Line bells up to play solo, or separate them for use with small groups. The set is flexible enough to be used in classrooms as an educational tool, or at home for the sheer fun of making music. Standard contents include a carrying case, eight bells (C-c Diatonic Range), and eight mallets.