The silicone exterior is always cool to the touch and the aluminum core will never have a drop of shisha stuck to it. This hybrid blend of aesthetics and function is perfect for those who want the best of both worlds. The silicone bowl is easy to clean and the aluminum core ensures that your shisha will never stick. The HMD (hookah bowl with a diffuser) is perfect for those who want to enjoy a smooth, flavorful smoke. The diffuser evenly distributes the heat, which allows the shisha to cook evenly and prevents the tobacco from burning.