This kit has everything you need to replace your bearings and service your wheels on your 1st generation board.
(8) Replacement wheel bearings (two needed per wheel)
(4) Wheel bearing spacers
(4) Bearing constraint o-rings (two needed per back wheel)
(2) Double shielded pulley support bearings (one needed per back wheel)
(4) Replacement wheel nuts
Read: How to change your 1st Gen Bearings
WARNING: Do not over tighten the axle nut or you could damage the bearing shields. Tighten just to the point where the wheel can no longer laterally move along the axle.