Orion Bear Banger Shells fit with the Orion Bear Deterrent Pistol/Launcher (sold separately).  

• 120 dB sound to scare off curious bears
• Waterproof
• Lightweight - .5 oz per piece
• Flash and bang is at barrel only.  There is no projectile.  (a rubber wad is ejected from the launcher about 30 feet)
• Comes with 4 shells