This Silicone Penis Acorn Ring Set by Kiotos is perfect if you want to experience the pleasure of a silicone acorn ring. Specially designed glans ring set for the tip of your penis. This set contains 4 silicone glans rings starting with 24 mm, then 28 mm, then 30 mm and finally with 33 mm inner diameter. These silicone glans rings are non-toxic and will make you smile. Easy to clean. Toy Cleaner is recommended.