Enhance your K'NEX building experience with this set of 3 big gears, each measuring 5 inches in diameter. These gears are perfect for creating roller coaster tracks and other geometric structures. The set includes one black and two yellow gears, made of durable plastic material. Suitable for kids aged 5 and above, this K'NEX replacement parts lot is a great addition to your building toy collection. The gears are compatible with K'NEX brand and feature a bulk/lot packaging option. They are perfect for educational play and roller coaster themed projects. Get your hands on this K'NEX gear building set and let your creativity run wild!