Slot.it inline starter kit with "small hub" aluminum wheels, bushings, wheel inserts, drill blank axle & inline 28 tooth crown gear.

Includes:

1x axle L. 55mm D. 2.38mm 
2x standard bronze bushings
2x aluminum wheels  15.8x8.2 mm 
2x plastic inserts BBS
1x inline 28t crown gear with bronze center
3x allen screw M2 3mm