Features: 100% brand new and high quality Made of superior material, durable to use .The principle of the product is: In a double-stranded molecule, A=T, G=C. That is: A G = T C or A C = T G; Simple and lightweight, easy to install Do not take up too mu space and help ildren improve their ability to work and think independently Products are enlightening teaing aids, and ildren can also learn simple and easy-to-understand scientific knowledge in the process of playing; Specifications: Color: As Shown Material: Plastic Product Size: 3311.6cm Package Content: 1 x Structure Column 1 x Base 1 x Sill Pillar 1 x Structural Slab 1 x Upper