Pololu Multi-Hub Wheel w/Inserts for 3mm and 4mm Shafts - 80×10mm, Black, 2-Pack

100:1 Metal Gearmotor 20Dx44L mm 6V CB with Extended Motor Shaft

298:1 Micro Metal Gearmotor MP 6V with Extended Motor Shaft

380:1 Micro Metal Gearmotor HP 6V with Extended Motor Shaft

3pi+ Chassis Kit (No Motors or Electronics)

78:1 Metal Gearmotor 20Dx43L mm 6V CB with Extended Motor Shaft

100:1 Metal Gearmotor 37Dx73L mm 24V with 64 CPR Encoder (Helical Pinion)

3pi+ 32U4 Control Board

131:1 Metal Gearmotor 37Dx73L mm 24V with 64 CPR Encoder (Helical Pinion)

150:1 Metal Gearmotor 37Dx73L mm 24V with 64 CPR Encoder (Helical Pinion)

Magnetic Encoder Disc for Mini Plastic Gearmotors, OD 9.7 mm, ID 1.5 mm, 12 CPR (Bulk)

63:1 Metal Gearmotor 20Dx43L mm 6V CB with Extended Motor Shaft

100:1 Micro Metal Gearmotor HPCB 12V with Extended Motor Shaft

Pololu Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack)

75:1 Micro Metal Gearmotor HPCB 12V with Extended Motor Shaft

19:1 Metal Gearmotor 37Dx68L mm 12V with 64 CPR Encoder (Helical Pinion)

20.4:1 Metal Gearmotor 25Dx50L mm MP 12V

3pi+ 32U4 Robot - Hyper Edition (15:1 HPCB Motors), Assembled

Pololu Ball Caster with 3/4″ Plastic Ball

3pi+ 32U4 Robot - Turtle Edition (75:1 LP Motors), Assembled

50:1 Metal Gearmotor 37Dx70L mm 12V with 64 CPR Encoder (Helical Pinion)

Pololu Wheel 40×7mm Pair - Black

63:1 Metal Gearmotor 20Dx43L mm 12V CB with Extended Motor Shaft