Futurola Knockbox 50 Pre-Roll Cone Filling MachineThe Knockbox 3 50 Cone Filling Machine is perfect for a smaller operation that still needs maximum efficiency The Futurola Knockbox 3 now comes in a smaller version that still packs the same great pre rolls as the standard version at 50 pre rolls in 90 seconds! The Futurola Knockbox 3 is compatible with more than 16 varieties of Futurola (and other brand) pre rolled cones that range in size from . 5 gram pre rolled cones up to 1 gram pre rolled cones.