Cheered richitig itself is keeping the coal about 90 min. long. I am very pleased. The premium may be rightly here. Moving the Shisha not as coal behällt their shape until the very end in and disintegrates or does not crumble as you know it from selbstanzündern. No ash taste no discoloration of the water. Top product. For anzuünden a Kohleanzünder is required. With NEM Bunsen dauerts to the quarter hour. per cube. :) And with NEM Lighter ...