I use a Kaloud Lotus head and have tried a number of different coals that people recommended for this system: Kaloud Aura, Titanium Flats, Coco Nara, and the Charco Flare - These are by far the best of the bunch! Kaloud Aura: Half-moon cuts, tend to burn out on the bottom for some reason and burn cooler even though the size is significant - For a coal designed for the product by the company that made it I expected better - Titanium Flats: I could fit four into the Lotus if I shaved a corner off the fourth but burned out too quickly, good for some good initial clouds but left the bowl half smoked - Coco Nara: Could only fit three in the Lotus and it left the heat lacking, even with the lid on and fully closed and burned out incredibly quick - Charco Flare: The quarter cuts are perfect to fit in to the Lotus and provide so much heat at the start that I can leave the lid of entirely and produce good clouds for 20-30 minutes - After that, the lid goes on with some heat management I can typically get another 40 minutes out of my session - The price is perfect, the heat they put out is great, and the fit is flawless - If you're not smoking with Charco Flare on the Kaloud Lotus you're missing out!