Plastic Variety Screw Nut Combination Disassembly Toy for Kids - 44pcs Puzzle Building Blocks Nuts & Bolts Builder Toys for Kids SAFETY: All pieces are non toxic made with high quality ABS plastic. No rust, not to hurt the hand BUILD ENDLESS COMBINATIONS: Create A variety of forms. Use your own imagination,let your baby become a little inventor! LEARN WHILE PLAYING: Helps children build fine motor skills, hand and eye coordination and generate ideas and creativity SOCIAL DEVELOPMENT: Encourages children to work together to build creations. Great family bonding activity will have FIRM AND STABLE.3D construction, using fasteners to assemble different parts, build and connect three-dimensional model with the nut, parts and components connect firmly, not easily scattered, exquisitely and vivid, full of fun