Coconut shell charcoal briquette cube types : Size a : 45mm (length) x 32 mm (width) x 25 mm (height) x 30 gram (weight) Size b : 25mm (length) x 25 mm (width) x 15 mm (height) x 9 gram (weight) This briquette type is ideal used for sisha smoking instead of cooking/grilling. Most of middle east countries use sisha/hookah for smoking by putting this briquette type in it. The big and small sizes are used depend on the sisha/hookah.