170 Pcs premium marble run set with transparent parts, endless fun for your child to watch marbles run along tracks <p>Premium quality set! Package includes 120 pieces variety color action parts which are made of high quality solid color plastic and 50 regular size glass marbles <p>All tracks are easy to stick together and the set is stable once build up with our professional designed molds <p>This STEM marble run set comes with an assembly instruction to help kids’ hand-eye coordination. After they learned, they will have ability to build any different tracks by their imagination and logical mind. Perfect Toy Set to develop kids’ creativity, logical thinking, hand-eye coordination. Play and Gain patient and problem-solving ability. Excellent Gifts for all kids <p>CHILD SAFETY: Meet US Safety Standard, Safety Test Approved, 100% Non-Toxic