These MIGHTY Mini Cannon's come in 6 different colors and are scaled down to a portable size for your enjoyment!  Looks can be deceiving as these cannons pack a mighty pop! Approximate AttributesBarrel: 3 5/8"Bore Size/Caliber: .22Fuse Hole: 2 mm (slightly smaller than 1/16")Ramrod and screw included. Steel Ball not included. Make sure to screw down mini cannon before firing.PLEASE NOTE: ONLY the 1.8mm fuse works with these; all other fuses are too large and will not work!