This double set of silver ben wa balls can be used both to tighten and excite. With each movement, subtle vibrations are created by the inner ball rolling rolling gently within the outer ball. With regular use, these balls can help tone the pelvic floor muscles, leading to stronger and more frequent orgasms. Held together by a nylon cord, and tethered with a handy loop for easy retrieval, this set of twin pleasure balls are perfect for anal or vaginal use. With no batteries to replace or noisy motors, the benefits are easy to achieve. Just insert and go!