Heat Management Devices are designed to regulate the transfer of heat from charcoal to Shisha. They also help reduce the passing of ash, fine particles, and harmful gasses from charcoal into Shisha. Heating without damaging the shisha (or molasses), the HMD devices make the smoke that the Shisha produces noticeably smoother, cleaner, and flavorful, while it also extends the life of a Hookah session considerably.