The #1 Mortar package in the business! The Excalibur firework comes with 24 of the best quality canister shells on the market and bundled with high-density polyethylene (HDPE) tubes. The shells included in the Excalibur Artillery Shell are the best available to the public, hands down. These high quality canisters break over 250 feet high, and over 200 feet wide. They are unsurpassed by any other consumer artillery shell.