This purple nipple pump allows you to gently raise your nipples with only one squeeze. Apply the nipple pump to your nipple and squeeze the bulb to create a light and comfortable suction. This nipple enhancing bulbs come with 4 erection rings. If you would like to use the erection rings, just slip the rings on to the bulb before you begin the suctioning. Once you have reached the desired hardness on your nipple, slide the ring down around your nipple to hold the erection in place! Easy as that!