Experience the intoxication sensation of glans stimulation with the Stainless Steel 4 Ball Head Ring. These babies are designed to give you a firmer cock for longer and to add more pleasure to your foreplay and masturbation practice. The 4 steel balls are not welded and can be moved so you can places where ever you want pressure the most. The diameter of the balls is 10mm. WARNING: do not wear Head rings during oral or anal.