A farm ought to have bales lying about, and here are four of them. Kids Globe presses them from real flax straw, so they feel like the thing they are a model of: rough, light, with loose stalks around the outside. They come in a clear bag with a card attached reading 'Round Bales'.
At 1:32 they match the usual toy tractors, Siku's included. That puts the whole run within reach: lift a bale off the field with the front loader, set it on the trailer, drive to the barn, unload and lay it along the feed rail. Children who already have a farm know straight away what to do with them.
Kids Globe gives about 4.5 by 3 cm per bale - small enough to stack on a trailer, big enough to pick up. Four to a bag.
A cheap little present that punches above its price: for a household that already has a barn, animals and a tractor, this is the piece that finishes the farm off.