The Sport Smoke BattleField Grenade is a cheaper way to get more training reps in while in the cover of smoke. Why pay $50-$75 a piece for a M18 smoke grenade when you can get 3 minutes of heavy smoke from a Battlefield Grenade for $14. Keep in mind I would only use these in a training senario as they are not built to ruck around or bang all over the trunk of your squad car. Here are the specs from their site:
Product Features
• Pull ring igniter• Thick smoke approx 3 minutes• Biodegradable• "Cool burning" Non-Pyrotechnic Smoke• Made in the USA