RANDOM COLORS & AFFORDABLE PRICES: Each set contains 235 pieces in random colors. Parts list and quantities are shown in the photo. Instructions are not included, allowing builders to unleash their creativity and problem-solving skills. Comprehensive and versatile: This technical parts set of 235 parts is designed to meet a wide range of architectural needs and has the right components for any project. FULL COMPATIBILITY: These parts are fully compatible with major brands and are perfect for MOC projects, car models, STEM activities, and more. Perfect for repairing, replacing or upgrading building blocks. Educational Value: This set is an excellent educational tool that promotes learning and development through hands-on play. Encourages creativity and imaginative building, providing hours of fun for both children and adults. Whether you're repairing, replacing or upgrading your building blocks, our technical parts set is your go-to solution for high-quality, versatile building components. Enhance your building experience and bring your innovative ideas to life with our premium technical parts set. Unleash endless building possibilities with this 235-piece technical parts set designed for compatibility with leading brands. This comprehensive set includes a variety of gears, gear racks, driving clutches and differentials made of durable and environmentally friendly ABS plastic. Whether you're working on a MOC project, a STEM activity, or just upgrading an existing model, this set offers the perfect assortment of parts to bring your creations to life. Package contents: Gear Rack 1/4 Circle 11 x 11 6573 Technical Gear Differential 62821 Technical Gear Differential technical worm gear Total of 235 pieces parts