The parts you need to assemble a skateboard are:
1) Deck
2) Grip Tape
3) Trucks
4) Wheels
5) Bearings
6) Bolts & Nuts

The top of the DECK is covered with GRIP TAPE to give you grip when you stand on the board. Two BEARINGS go into each WHEEL so they can spin freely on the TRUCK axles. The TRUCKS are attached to the DECK with BOLTS & NUTS.

Optional parts:
1) Riser Pads - These go between the Trucks and Deck to raise the skateboard and give more clearance between the wheels and the bottom of the deck, and they also help to absorb some impact.