knex mecha strike 18515K'Nex Mecha Strike 18515A great toy that children can develop themselves in 3D in the fields of science, technology and engineering by combining their imagination An original toy made of quality material Perfectly designed rods are connected to each other with the help of connectors combine and create your design. Each color group has different measurements so you can place the pieces appropriately. (Green pieces 1 cm, white pieces 2 cm, blue pieces 3