Look for a pair of G6 Gator blades. Since you didn't specify a brand and model, here is a link where you can read about and search for them. Amazon should have some as well. The G6 blades are wider than the cheaper version (G3), are also thicker and are hardened.
These blades are very heavy duty and are sold for a very good price. I would compare them to the G6 gator blades. They are Copperhead brand and made in the USA. You will have to search Amazon with the make of your lawn mower and blade size to find out if they have the ones you need.
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