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Summit Racing SUM-590300: Transmission Blanket Universal SFI 4.1 Safety Rating Nylon Black. 47 in. Long 11-1/2 in. Wide Each – NHRA rules require that any automatic transmission-equipped car running 10.99 or quicker or faster than 135 mph must also be equipped with a transmission shield or blanket-type shield with an SFI rating of 4.1. Our Summit Racing transmission blankets are made from high-quality materials to be both oil- and water-resistant and they do have an SFI-approval rating of 4.1. These safety blankets install easily with attaching straps and have an absorbent pad to help protect against oil spills.