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Most Micro racers set up their cars by blocking them at 1-3/4" or 2" and make changes from there on the car. The JOES design includes magnets to keep them from falling off your car. We anodized them bright red so they are easy to locate and laser engraved the heights on the front for ease of use. JOES Setup Blocks are a simple and compact design, specifically for Micros. Sold in pairs.