Descrição: A flat piece of spring steel vibrating against a piece of plywood.

Descrição: The melodic vibration springing vibration from a plastic arm attached to a wall.

Descrição: The melodic vibration springing vibration from a plastic arm attached to a wall.

Descrição: A flat piece of spring steel vibrating against a piece of plywood.

Descrição: A flat piece of spring steel vibrating against a piece of plywood.

Descrição: A flat piece of spring steel vibrating against a piece of plywood.

Descrição: A flat piece of spring steel vibrating against a piece of plywood.

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