The meal powder must be a fast burning, ball milled mix using a fast burning type of charcoal. Replacing the titanium flakes with 20 mesh flake aluminum will produce a good firefly effect. Gerb Case: 1-1/4″ I.D. x 1-5/8″ O.D. x 7″ long Clay Nozzle: 2 level tbsp of fire clay with 1/4″ dia. vent hole. Charge: 1 heaping tbsp per increment 400g of this composition will be enough to make three gerbs. Approx. 16 second burn time.