Wavy on top with a smooth underside, that is the Basix 16" Double Dong. The contours on top aim to stimulate and the smooth underside makes it slip in and out easily. This pink sex toy is really made for two but it can also be used for solo action.The PVC rubber used is completely free from latex and phthalates and it is also proudly US produced. It is 16 inches long and 1.5 inches wide.