A 5.9mm pellet for use in 6mm airsoft gun or grenade. I am not responsible for any damage to your gun or other airsoft device you use this print in. I recommend sanding the pellet round to avoid jamming. I used a chronograph to measure the fps on the pellet using my Game Face M14, and it measured at 150 fps, half the normal speed. This is more of a experiment than anything, because making a ton of pellets is much harder than buying 10000 bulk pellets.