This weighted set of double BenWa balls are perfect for vaginal or anal use. With a double-layered design that allows the inner ball to roll freely inside the outer ball, you can enjoy extra sensations as you wear it throughout the day. The silicone material is velvety soft, hypoallergenic, and phthalate-free. Even the looped pull cord is silicone! You can use these weighted balls for pleasure or toning your personal muscles. Clean after use with mild soap or toy cleaner. Do not use with silicone lubricants only water based.