Excalibur Fireworks 24 pack artillery kit. The #1 selling artillery shell of all time and considered the best firework artillery shell on the market! The Excalibur Artillery Shells have been wowing fireworks enthusiasts of all ages for the last decade and will continue to wow them for years to come. Often imitated but never duplicated! The shells are 4? long and 1.75? in diameter.? These maximum charged Excalibur Canister Shells launch up to 250ft in the air and break 200ft across the sky with vibrant colors and effects.