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Kimbrough 90 Tooth 48 Pitch Gear kb149 Kimbrough Products gears are not molded with large open holes to save weight and plastic because Nylon absorbs and releases moisture. Depending upon the amount of moisture in the atmosphere, it will shrink (in dry air) or grow (in wet air). If a Nylon gear has large open holes, it will become out of round if it doesn't have the same amount of moisture it had when molded. Besides, Nylon is such a light plastic that solid Kimbrough Products gears are less then .5% heavier than the lightest gears on the market. If you consider total rotating mass weight (motor-armature, wheels, tires, etc.), this slight weight difference becomes insignificant.