Suitable for the Kaya and Kangoo hammocks. "Woopy" is a stainless steel spiral spring specifically designed for ceiling suspension of baby and toddler hammocks. The smooth, gentle swinging of the spring mimics the experience of a baby in the mother's womb. It promotes relaxation and well-being, helping your little one fall asleep quickly and soundly. The included fabric cover prevents fingers from getting caught in the stretched spring.