This prostate massager is made from smooth black skin safe material,the unique shape of this prostate massager is designed to slip comfortably into the anus to tease the prostate while the rounded end with integrated ball bearing rubs deliciously against the perineum. This massager allows for easier prostate stimulation and slips neatly into the anus while the external tip massages the perineum with a smooth roller ball. An easy grip handle allows for complete control and exact penetration experience you desire. Function：