All the strakes that you can see attached to their sprues, all 20 of them, need to be soldered onto the wheel treads, which is a time consuming and not too easy task. It’s a very soundly engineered and well produced kit, but this part of the construction is painfull. I made a start on one wheel but got fed up and dumped it back in its box. It will eventually be the load for a NE agricultural machinery wagon.