One (1) each - 24/26/27/28/30 tooth brass crown gears. Brass crown gears are slightly heavier than Slot.It's aluminum crown gears; however, they are generally more durable. Like aluminum crown gears, they require lubrication to prevent excessive wear. Our Super Lube Grease with PTFE (see product link at bottom of this page) is an excellent lubricant for this purpose.
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