Firecrackers have to be individually lit and are small in size, but they produce a loud report. Firecrackers can also come in a brick, which are packs of firecrackers fused together. When you light the pack, they all go off in a matter of seconds. The last way firecrackers are put together is in a strip. Firecrackers are fused to a connecting fuse. When lit, the firecrackers go off in sequence. Fun fact: firecrackers are said to be the oldest fireworks to be made.