Proslot factory blueprinted ball bearing super16d or 16d complete #2100bb Speedfx can setup with magnets and endbell with hardware for 1/24 scale new on original card. Ball bearing factory installed in can and blueprinted.  Install your favorite arm with brushes and springs and GO FAST. We will leave positive feedback once the customer has recieved their item and are satisfied. $5.99 shipping and handling USA. We are closed on weekends so all messages answered Monday- Friday.