Canister shells come in a variety of sizes. Consumer fireworks can be anywhere from 2 inches up to 6 or 7 inches in length. Unfortunately, most consumer do not understand the limits on the number of grams of explosive powders that can go into the manufacturing of these types of fireworks. A four-inch shell, using as an example the Excalibur mortar shells, contains 60-grams of powder. Where the five-inch Excalibur Platinum may be longer in length but still only contains 60-grams of explosive powder. All this is control by the Consumer Product Safety Commission, (CPSC). Upon entry into the United States, containers and products are randomly checked for their contents and the amounts of explosive powder used in any particular item. If the item does not meet the requirement, it is immediately removed from circulation and destroyed in most cases. Canister shells also are made with lower amounts of explosive powder as well, like the "Home of the Brave" by World Class fireworks. It is in the canister shells category but only contains 40 grams of powder. Buy fireworks online for the best prices, with all fireworks delivered warehouse direct to your door. Visit our Blog | fireworksstoresonline.com for more information on canister shells. Order all your celebration item from our wholesale fireworks for sale online.