Black, silicone butt plug with 2 shaking heavy balls inside to create a unique sensation. The 2 balls will knock and shake once you inserted. Wearing of these balls is so very enjoyable and exciting sensation. Key Features:- Length: 1.25 cm- Insertable length: 10 cm- Diameter: 2.3 cm and 3.3 cm- Color: Black- Material: smooth silicone Note: Use only with water based lubricant! Contact with oils and creams (sunscreen, edible oil, lip balm, etc.) may cause irreversible damage to the control unit and the entire toy. How to clean: Carefully clean the toy before first use and after each use with warm water and a mild soap. The cleaner is especially suited for cleaning erotic toys