3D Gear Tech is an exciting introduction to the exciting world of gear mechanics: it demonstrates cause and effect; stimulates reasoning and creativity; and develops mobility skills for endless hours of fun and discovery. With gears in 4 sizes, pillars, 6- way axles, connectors, universal joints, chains, belts and interlocking plates children can build fantastic 3-dimensional structures and put everything in motion with spectacular chain reactions. This advanced 266-piece set comes with the all-new universal joints to transmit rotary motion to distant gears. Also included are the new chain and elastic belts, instruction manual and visual assembly instructions.