Flat shisha charcoal: F17 or F20?
F17 (17 x 25 x 25 mm) burns for 70 minutes and fits the smallest heat management devices and shallow phunnel bowls. F20 (20 x 25 x 25 mm) burns for 80 minutes and is the more versatile choice for lounges that still use foil. Both run 80% fixed carbon with white ash at 1.9% maximum, in line with the rest of the shisha range.

