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SSD Steel Brake Rotor Weights are a great way to add some weight down low. These weights install in between the wheel and hex hub, creating the look of a brake disc while at the same time adding 39 grams of weight to the wheel and increasing your track width by 3mm per side. These weights are compatible with all SSD wheels, as well as other SLW compatible wheels and hubs. Package includes two rotor weights and hardware.