Here are the main points for an informative speech about the major kinds of fireworks: i. skyrockets explode high in the air, producing the most dramatic effects of all fireworks. ii. roman candles shoot out separate groups of sparks and colored flames with a series of booming noises. iii. pinwheels throw off sparks and flames as they whirl on the end of a stick. iv. lances are thin, colorful fireworks used in group displays. these points are organized in order.