Simple but powerful these suckers can be used anywhere on your body where you would like to experience increased sensitivity and temporary enlargement but they are especially effective on your nipples. With a wider cylinder than others this set will pull your entire areola and surrounding flesh into its tight pressure as you twist. Forget about complicated pumps and accessories these silent and discreet nipple suckers make for convenient unique fun. Internal lubrication creates smooth movement and a strong seal. Opening diameter of 2.25 in. 4.25 in. long with a cylinder that accommodates 2 in.