I've got 6 or 8 white 2x4 bricks. But they seem to be rather old as there is a "Pat. Pending" on it and also a "C5".

They also have one small hole on each of its sides (but none on top) and the interior is transparent.

Does anyone know from which set this comes?

view from underside

1 Answer 1


This is Brick, Modified 2 x 4 with Wheels Holder, Trans-Clear Bottom. White colored version was included in 77 sets.

  • 1
    ...and they go together with wheels like these.
    – noughtnaut
    Commented Feb 6 at 12:45
  • @noughtnaut this brick is not limited to wheels like these. There are more elements that go together.
    – Alex
    Commented Feb 6 at 16:43
  • Yup. That was intended merely as an example for people who've never seen this brick before.
    – noughtnaut
    Commented Feb 7 at 11:57

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