It's All Ball Bearings Nowadays...
24VDC HENNKWELL BALL BEARING MOTOR
Even this 7/8" x 2-1/8" Hennkwell ball bearing reversible gear motor is ball bearings. Fletch could have told you that. Operates from 6-24VDC (optimal being 24VDC, turning at 142 rpm). Item number PZ22GR9120R-084BBH. Has a (2)-shafted front shaft (6mm dia x 14mm length), and a rear shaft with a 2mm dia x 11.2mm length. Also has (4) front-threaded mounting holes and solder lug terminals. Made in Taiwan.