Feature: 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. Specification: Item Type: Chemistry Molecular Model Kit Material: PP Product Size: Approx. 21.3 x 16.5cm / 8.4 x 6.5in ( Manual Measurement, Slight Error May Exist ). Package List: 57 x Atom1 x Storage Box40 x Short Bond16 x Double Bond