20 car set from Thailand that was part of a Mattel Factory Challenge (including Hot Wheels Malaysia, and Matchbox).
This set is part of a challenge between Mattel's China, Malaysia and Thailand factories to come up with a special set of 20 cars to be sold on HotWheelsCollectors.com. The Thailand plant came up with the Mutant Biotronic Kingdom set featuring twenty creature themed cars.
The initials for the set are MBK, which represents the factory's name Mattel Bangkok.
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