Material: Plastic (ABS classification). Safe: The pieces are lightweight but large with rounded edges to make sure your little one can play safely.. Options: 15-piece, 25-piece, 36-piece, 42-piece, 52-piece, 64-piece, 88-piece, 100-piece, or a 130-piece set. Building Blocks: Get a magnetic building blocks set. Easy to Use: With magnetic rods and connecting pieces, this set of building blocks is easy for your child to use independently and create all sorts of structures. Applicable Age: Suitable for 4-6 year olds. Magnetic Rod Building Blocks | Living Social | Living Social