Premium Nylon Heavy Duty Lawn Aerator Shoes - 4 Adjustable Straps and Metal Buckles - Nylon Aerating Sandals with Zinc Alloy Buckles - Extra Spikes and Bonus Wrench Included HEAVY DUTY NYLON SHOES - All of the manual lawn aerator shoes on Amazon are made from plastic. The Gardenite shoes are made from nylon, a tough synthetic polymer which is much stronger than plastic and will last much longer. 4 HEAVY DUTY STRAPS WITH ZINC ALLOY BUCKLES - Gardenite shoes feature heavy duty straps with zinc alloy metal buckles that won't break. Many lawn aerator sandals have flimsy plastic buckles which are not strong enough to hold the aerator shoe in place. We also give you an additional 4th strap should you need it to secure the shoe in place. EASY ASSEMBLY INSTRUCTIONS - Included are easy to follow assembly instructions. Assembly is quick and easy. EXTRA SPARE PARTS AND WRENCH INCLUDED - Additional spikes and nuts included. The 2 inch spikes are super strong, however we include extras in the box should you ever need to replace one. 100% CUSTOMER SATISFACTION GUARANTEE - Backed by the seller Equinox International. Our 100% customer satisfaction guarantee has you covered. We will always replace a faulty product or refund your purchase if you are not happy for any reason.