Features: • Each part has been measured and tested by the professional machine,to ensure the exact right tightness while assembling. • Top non-toxic quality ABS material, ensure realiable quality and safe to the kids. • This building block toy is designed with our professional team, creative,fun and attractive. • It's suitable for school and family teaching,can cultivate kids' imagination, ability of eyes and hands,cooperation. • This can strengthen the relationship between the kid and their teachers,parents,friends via playing the block toys.