26 heavy-duty spikes will break compact soil and maximize air flow and water absorption to the ground you walk through. - Those ellipse plastic circles at the bottom of the shoes will prevent the shoe board from cracking from the middle. - It gives more weight support than most of other spike shoes on market. - Longer spike will pierce deeper. Our spikes are about 5cm, which is about 2inch. It is longer than most of spikes on the market. Reach deep of the soil, and more air to the root. - Walking through your lawn will give you more exercise, and you will not need to pay your local contractor for aerating. - Comes with wrentch, spikes, etc., just need assemble and ready to use.