Tenga Premium Rolling Head Cup is a masturbator with a unique shape. It has a movable spiral that can be bent freely. The Premium series is characterized by an even better quality of workmanship and a more complicated interior full of insets that provide a more intense experience. The pressure inside can be adjusted with the opening on the top of the product. A network of stimulating tabs inside the sleeve. Intense sensations. Internal pressure control. Easy to maintain hygiene.Flexible spiral .