The ECR4Kids Manipulative Mania — Set 2 stretches imaginations and extends creativity beyond Set-1. Children will continue to challenge themselves as they roll, twist, and lock pieces to construct building, towers and more. Sets encourage the development of hand-eye coordination, motor and basic math skills. Each group of manipulatives is packaged in a clear tub with convenient lid and handle that stack to save space. Manipulative Mania - Set 2 is comprised of the following: Gears Galore (ELR-19205), Twist and Lock Nuts and Bolts (ELR-19206), Caterpillar Bits and Pieces (ELR-19207), and Cube Creators (ELR-19208).