Siku includes toy models made of metal and plastic in various scales and diverse themes. The Super Series features car models and primarily covers the themes of city, rescue, construction, and special vehicles in scales of 1:87, 1:55, and 1:50. There are also some budget-friendly models without a fixed scale. Agricultural vehicles (e.g., tractors, harvesters, and attachments) in scales of 1:87, 1:50, and 1:32 are part of the Farmer Series.