Duo Balls draw their inspiration from the Ancient Chinese Duotone Balls that had a relaxing, chiming action when gently rolled in the hands. The balls contain rolling weights inside that move around with the slightest movement of your body, and are made of soft spiky latex. The result is a truly orgasmic experience as the balls gently move around inside of you. Withdraw them very slowly at the point of climax for the best orgasm you are ever likely to experience.