ã??This set is compatible with major brandsã?? NKOSC brand educational toys are stronger than other similar sets, and all paper instructions are provided. Therefore, we are very confident that you will like it, if you have any reason not to like our stem building project block, you can return the item and get a full refund. ã??More Game Guides - 20 Architectural Design Guidesã?? Our tinker toys contain 20 architectural designs and full paper instructions, It is appropriate for beginners and intermediate builders.This 171-piece gift idea set will help kids build fine motor skills, hand-eye coordination and enhance creativity while keeping them entertained for hours! Which means more time for mom and dad! Supports logical thinking and problem solving, unleashing your childâ??s imagination to endless possibilities. ã??Help your child build engineering skills earlyã?? NKOSC Toys Engineering blocks are designed to develop your childâ??s social skills at an early age. Encourages children to work together as a team to build awesome creations, inspire young minds with stem building toys challenge children, to build anything they can imagine, Increasing their imagination and creativity our educational block sets play with children as they grow! ã??Educational Toys-Learning Giftsã?? Engineering blocks supporting STEM are intended to cultivate your child's science, technology, engineering and math skills. Challenge your kids to create creative designs, motorcycles, submarines, helicopters, sled cars and more! Suitable for birthday and holiday gifts for children aged 6, 7, 8, 9, 10, 11, and 12. ã??Guaranteed hassle-free enjoymentã?? the NOKSC construction engineering kit is made of ABS plastic, which is easy to clean. Each toy is free of phthalates, lead, cadmium, and ASTM certification. Our investment in child-friendly materials and rigorous laboratory testing ensures that your children are 100% protected from harmful chemicals.