Features • PTB120 are soft, rubbery, interlocking Hedgehog Building Blocks that stick together at any angle makes it easier to build. • PTB120 provides a good way to develop children's creativity at a young age. Your children can acquire a strong sense of color, geometrical shapes, & architectural design. • PTB120 Hedgehog Building Blocks set has a different brightly colored piece which provides kid's endless building possibilities. • PTB120 Hedgehog Building Blocks set can build different objects such as a car, a house, a robot.