Block Mates™ build upon the wonderful foundation of unit blocks by providing children with a themed exploration set, designed to enhance the original principles of block-building. All Block Mates™ are designed to fit standard unit blocks and can be built in their natural form or mixed and matched with others in the set to create new, imaginative vehicles or creatures. Our patented gasket design ensures a snug fit. Set of 4 construction vehicles: Dump Truck, Sanitation Truck, Back Hoe and Cement Mixer. Features rugged sure-grip wheels with steel axles. Blocks not included.