Features: 1. The brick bites tightly and should not be dropped 2. Cultivate children's hands-on ability 3. Expand children's hobbies 4. Collectibles for building block fans Product name: Mechanical password Article number: 701800/701802 Material: environmentally friendly ABS Assembly size: as shown Number of particles: 665pcs/841pcs Applicable age: 6 Note: 1. Our products are 100% brand new, please rest assured to buy. 2. Our building blocks are produced with high precision by machines. Generally, there will be no missing parts, and there may even be extra parts. 3. Because the toy box is too big and the shipping cost is too high, so the building blocks we sell without original package(No box,And If you are going to make it a gift, I suggest you prepare another gift box, it will be more cost-effective.)