Your kids can build countless models according to the manual and use their endless imagination. It can cultivate kid's hands-on ability and innovation consciousness.Playing the scientific & artistic blocks and building something with kids allow you to enjoy pleasant & relaxing moments, get closer to kids and establish a healthy, positive parent-child relationship. The cuboid building block set is made with food grade material, BPA-Free, Non-Toxic, ABS plastic, conform to CE, ASTM, and EN71. Colorful and round edge design without sharpness will protect your kids from getting hurt while playing. Rinse the blocks under running water, then wipe them with dry cloth or place them in a well-ventilated area to dry thoroughly. Do not immerse the blocks into water or any other liquids!