1.3g Fireworks tend to be more powerful that 1.4g, but that’s not always the case. What makes a firework 1.3g is influenced by many things. One being that if the burst charge or effect in a single tube contains more than 5% flash powder then it becomes 1.3g. Rockets over 20g also automatically become 1.3g. In certain instances a 30mm tube of 1.4g will be more powerful than a 20mm tube of 1.3g based on the chemical make up. So whilst most 1.3g products are more powerful, there’s a bit more to it.