100% silicone materials. safety, durable and odorles. compatible with most Hookah Hoses. This is a Standard size Hookah Grommet Set. Can Fit in the hose adapter of your hookah. Prevent the hookah hose from falling out while smoking. Pakcage includes: 100 pcs per pack. It can grip the tunnel of bowls very well. No Leaking, No Sliding.