Sealed Ball Bearing - TOOGOO(R) 17x40x12mm 6203-2RS Double Side Sealed Ball Bearing Select 2RS for a sealed bearing , has two contact rubber seals one on each side of the ball bearing. If your application requires a 6203 ball bearing with only one seal you can get this ball bearing and take one of the seals off. can take electric motor demands if needed. Used widely in industrial machine, motorcycle, automobile, power tools and mechanical equipment and other kinds of field.