With the Carbo One all-in-one bowl and heat management device (HMD), all you need is 1 cube of coconut coal for your session. This innovative product made from high quality anodized aluminum combines a phunnel-style bowl with HMD to make managing the heat of your bowl easy. One cube of coal can last up to 60 – 90 minutes of smoking time. No bowl grommet required. The bowl’s silicone shaft secures directly onto your hookah.