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They are the mini fuses, I keep a ziplock with 5-25 amp fuses. It's something I carried over form my diesel (when towing it blew fuses pretty frequently for whatever reason). Only had to use it once on the stang but I was glad I had them since it was my tuner that blew it. You can get a kit at autozone or anywhere like that with a bunch of different fuses and a fuse puller for 10-20 bucks max.