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These flexplates are a great upgrade to your stock design. They feature extra-thick steel that's double welded to the ring gear for added strength and they are gold anodized for corrosion resistance. Available in either SFI-approved or standard, these flexplates will withstand the extreme power and RPMs of today's engines. Our Lightweight Flexplates are: SFI 29.1 certified of high Quality HSLA 60 grade steel, Tested to 12,500 RPM, The Lightest flexplate available anywhere and are manufactured in the USA Zinc plated for corrosion protection 60.1 lb.-in.2 moment of inertial - 51% of the moment of inertia of an equivalent typical OEM flexplate. Significantly improves your engine acceleration and deceleration.