The Squidnation Slammer Chugger 3" has a head diameter of 11mm and the 5" 20mm, which is big enough to move water when trolling, and small enough to be smaller than the gap on conventional 7/0, 8/0, and 9/0 circle hooks. This tiny bait enhancer tracks true and won't jump around in rough seas, but it's still big enough to make the ruckus necessary to bring billfish into your spread.  The small diameter won't hamper billfish bites, and makes this a great way to entice fish.  Sold in several vibrant colors, both individually and in 10 count packs, this tiny chugger is a great value.