This Ribbed Stainless Steel Prostate Massager is contoured, so it rests against your prostate glans. The heavily ribbed shaft is fun to thrust with and teases the prostate with every stroke. Measuring in at 6"/15cm in length of which 3"-4"/7.5cm-10cm is insertable. The ball has a circumference of 3"-4"/7.5cm-10cm which makes it a lot of fun and easy to use. It is easy to clean, and as it is metal, it is perfect for temperature play. Try warming it in warm water or chill it in cold water before use for delightful sensations. This is an anal sex toy that is fun to use on your own or with company. Made from quality stainless steel; it will last a lifetime.