This is a set of two drivetrain parts for the Tamiya TT-02B. ① Square Hard Steel Pinion Gear 20T (0.6 module) ② Option No.1 Full Bearing Set (1280 x 4, 1150 x 12) I bought these to do four-wheel drive, but I ended up not buying a four-wheel drive car, so I'm selling these as I have no use for them. They are new and unused, but please understand that they have been in someone's hands before you purchase. No returns or exchanges. Please ask any questions before purchasing.