N20 Vibration Motor, Small Size, Easy Mount | NFPshop.com
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tatoko 20PCS 10mmx3mm Mini Vibration Motors DC 3V 12000rpm Flat Coin Button-Type Micro DC Vibrating Motor for Mobile Cell Phone Pager Tablet Household Appliances - Amazon.com
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DC 3V 3.7V 12mm Small Mini N20 Vibrating Vibration Motor Vibrator Toy Massager | eBay