You can safely purchase customized 12mm hollow cup brushed DC motor products from our Chaoya factory.We are looking forward to cooperating with you. If you want to know more product information,please feel free to inquire and we will reply in time.The 12mm Hollow Cup Brushed Dc Motors is a small motor among our many sizes,it has a diameter of 12mm, a length of 20mm,and a power of only 12w. It is a powerful, efficient and compact motor.