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This is a 1.75" Slot mag that will fit the Tamiya Sand Blaster Jr (Front Tires on the Rough Rider, fronts on FAV, etc) and possibly other 1.75" tires. These are a one piece style wheel. One wheel per order so if you want both rears, you must order 2. The Nylon is the cheaper and more robust option but lacks fine details and will need much more work to clean the surface. Ultra detail is what you will need for an easy, finished look.