Keep your marbles masterfully organized with our stackable “GraviTrax Ball Box” set, complete with 4 snap-shut boxes and 12 new marbles! Don’t lose your marbles! Our handy “GraviTrax Ball Box” set holds 24 of those shiny spheres you love to watch fly down your GraviTrax race track! With 4 stackable boxes included (2 green, 1 white & 1 grey), you can organize your marbles by color or just mix them up as you like. We’ve included a dozen new marbles; 6 silver and 2 each of red, blue and green. A great accessory to add to any GraviTrax product! Experience the power of gravity and educational fun today and build beyond the usual! What makes a great toy? GraviTrax checks all the boxes! It’s a creative, modular, expandable track system that challenges children to use their imagination to design and build their own marble runs! GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Completely open-ended, every GraviTrax set has a boredom-busting variety of play options for hours of fascinating fun. Once the basics are mastered, simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams! Comes complete with instructions, 4 Ball Boxes (2 green, 1 white, 1 grey) and 12 metal marbles (6 silver, 2 red, 2 blue, 2 green). Lasting durability for girls and boys ages 8 and up; it’s the learning toy children (and savvy adults) return to over and over again!