? Eco-Friendly Solid Wood Body? This white noise machine features a sustainable solid wood shell, offering a high-end feel with unique natural textures and tones that complement any d cor. Unlike plastic, the eco-friendly wood is renewable and durable, ideal for a healthier sleep ...? Eco-Friendly Solid Wood Body? This white noise machine features a sustainable solid wood shell, offering a high-end feel with unique natural textures and tones that complement any d cor. Unlike plastic, the eco-friendly wood is renewable and durable, ideal for a healthier sleep environment.