The most powerful pre-roll on the market is the 58% Delta 8 Pre-Roll. Made of Bubba Kush flower combined with Delta 8 makes for a powerful smoke. Each 1.25 gram joint contains 580mg of Delta 8 THC. Each pre-roll comes with an air tight/water proof reusable tube.
Warning: Although legal according to the 2014 Farm Bill, do not use this product if you intend to be drug tested as you most likely will fail since delta 8 THC is similar to Delta 9 THC.