1、Made of eco-friendly plastics material, with smooth surface, no scraps or cutting edges from the holes, wear resistance and can provides long service time. 2、Uses spheres to represent atoms and s-ticks to represent chemical bonds. 3、Can be used to build methane ball-and-stick model, ethane ball-and-stick model, ethylene ball-and-stick model, ethyne ball-and-stick model, benzene ball-and-stick model, phenol ball-and-stick model, ethanol ball-and-stick model, acetic acid ball-and-stick model, carbon dioxide ball-and-stick model, and etc.. 4、Easy to install and easy to detach, easy to build models for organic and inorganic chemistry. 5、Comes with one plastics box, easy storage and with fine portability. 6、Suitable for middle high school, high school and university teaching and studying. 7、Help teachers and parents to cultivate children\u0027s interest in chemistry, makes learning chemical 3D molecule or atomic structures fun and interactive. This is a kind of quality chemistry molecular model kit, which is made of eco-friendly plastics material, wear resistance and can provides long service time. Uses spheres to represent atoms and s-ticks to represent chemical bonds. Easy to install and easy to detach, easy to build models for organic and inorganic chemistry. Help teachers and parents to cultivate children's interest in chemistry, makes learning chemical 3D molecule or atomic structures fun and interactive. Have a try. Features: Made of eco-friendly plastics material, with smooth surface, no scraps or cutting edges from the holes, wear resistance and can provides long service time. Uses spheres to represent atoms and s-ticks to represent chemical bonds. Can be used to build methane ball-and-stick model, ethane ball-and-stick model, ethylene ball-and-stick model, ethyne ball-and-stick model, benzene ball-and-stick model, phenol ball-and-stick model, ethanol ball-and-stick model, acetic acid ball-and-stick model, carbon dioxide ball-and-stick model, and etc.. Easy to install and easy to detach, easy to build models for organic and inorganic chemistry. Comes with one plastics box, easy storage and with fine portability. Suitable for middle high school, high school and university teaching and studying. Help teachers and parents to cultivate children's interest in chemistry, makes learning chemical 3D molecule or atomic structures fun and interactive. Specifications: Name: Chemistry Molecular Model Kit Material: PP plastics Model: ZX-1032A Atoms, Holes/Angle, Color, Dia.(mm), Qty(pcs) H-Hydrogen, 1/ , white, 17mm, 30pcs C-Carbon, 2/180°, black, 23mm, 2pcs 3/120°, black, 23mm, 6pcs 4/190°28', black, 23mm, 15pcs O-Oxygen, 2/105°, red, 23mm, 6pcs N-Nitrogen, 3/107°, light-blue, 23mm, 3pcs 4/109°28', light-blue, 23mm, 4pcs S-Sulfur, 4/190°28', yellow, 23mm, 2pcs 6/90°, yellow, 23mm, 8pcs Cl-Chlorine, 1/ , green, 23mm, 6pcs Br-Bromine, 1/ , brown, 23mm, 2pcs Metal, 1/ , silver-grey, 23mm, 1pcs P-Phosphorus, 5/120 90°, light-purple, 23mm, 1pcs Chemical Bond(hardness), color, length(mm), quantity(pcs) Short-Bond(used for scale model singlebond), milk white, 10mm, 30pcs V-Bond(used for scale model double bond), white, 12mm, 6pcs Medium-Bond(singlebond), white, 27mm, 50pcs Long-Bond(double/triple bond), purple, 43mm, 18pcs Overength-Bond, milk white. 62mm, 6pcs Disconnector tool(used for disconnecting model), ivorywhite, 76mm, 1pcs 90mm C60 set, 60pcs balls and 90 pcs hollowtube Item size with box: 235 * 170 * 35mm / 9.25 * 6.69 * 1.38in Package size: 235 * 170 * 35mm / 9.25 * 6.69 * 1.38in Package weight: 543g / 1.20lb Packing List: 1 * Box of Chemistry Molecular Model Fittings 1 * Box of Chemistry Molecular Model Fittings