1、3D Modeling: These molecular models show chemical structures, molecular bonds and bond angles in all directions. The 3D modeling study demonstrates basic molecular geometry, chemical molecular structure and stereochemistry. 2、Easy to Learn: This chemistry molecular model kit adopts universal standard for each atom's color makes it easier for you to use and learn. 3、Easy Disassembly: The atoms and chemical bonds of these molecular structure models combine tightly and firmly and can be easily disassembled by disconnecting tools. 4、Colorful PP Balls: This molecular modeling kit adopts eco friendly PP material, vibrant colors and exquisite craftsmanship ensure longer service life. 5、Increase Learning Interest: These organic chemistry models can increase students' learning interest and teachers can explain it more visually and conveniently. 57 x Atom1 x Storage Box40 x Short Bond16 x Double Bond Item Type: Chemistry Molecular Model KitMaterial: PPProduct Size: Approx. 21.3 x 16.5cm / 8.4 x 6.5in ( Manual Measurement, Slight Error May Exist )