• Large Set: 312 pieces in total: 251 pieces (effective parts for assembly). 63 balls (3 fluorescent balls included), 1 dedicated storage bag (easy to store) • ENDLESS WAYS TO PLAY: This is a Pythagora toy. Learn more logically to assemble while playing. It is interesting to assemble the ball with a variety of thinking. The basic way to play is to connect the grooves together and create 3D structures. The parts are quite voluminous, so you can combine them with many combinations. Assemble them and disassemble them repeatedly. They can be creative and played. The simple shape building blocks will bring out your child's creativity • (Safety Commitment) Made of high quality plastic (food grade ABS plastic) material and is BPA free. Play with confidence. Child safety is our top priority! However, the accessories are very small. Suitable for children over 7 years old • Educational Play: Blocks building elements allow imagination. The parts are quite voluminous, so you can combine them with many combinations. Assemble them and disassemble them repeatedly. They can be creative and played. The simple shape building blocks will bring out your child's creativity. In addition, since the ball is chasing your eyes, it encourages a sense of three-dimensional sensation, you can concentrate on playing with it, so you can also develop spatial cognitive ability • (Quality assurance) If the product is defective, please contact us immediately and we will accept a free exchange or full refund