This 77-piece set is a far-out twist on a classic building set. This space-themed set includes astronauts, planets, the sun, a spaceship, a flag, colorful stickers, and more. It's the perfect way to help your little space fans learn engineering, problem solving, and more. Since there's no end to the possible combinations and designs your child can create, the learning play can keep your kids engaged for years. Astronauts measure 2.5". Our Gears! pieces are made from sturdy plastic and snap together to bring colorful motion to any creation while challenging motor skills and creativity. Compatible with all other Gears! Gears! Gears! sets for even more imaginative fun.