Review on 250 Pieces STEM Building Blocks, Pipe Tube Sensory Toys, Creative Tube Locks Construction Set With Wheels, With Storage Box, Preschool Educational Learning Toys, Present Gift For Boys Girls Aged 3+ by Porfirio Newitt

To expand the building projects for these blocks beyond the set itself and Duplo Blocks, I located some 12mm OD straws that allowed us to connect the large ends of the tube building pieces. The straws gave us a piece with two small ends--which the set does not include. With a few cuts to these straws, we had multiple sizes and greatly increased our building abilities. The photo illustrates this pretty well.