This vibrating cockring has such plush silicone. The inner diameter unstretched is 1" (2.5 cm) but it has a lot of give to stretch while being thick enough to provide a good squeeze. This Adore U ring has a removable rechargeable bullet with 4 speeds and 6 patterns. It has a soft, ultra-silky 100% silicone texture. Adore U has a one-year warranty on their products.