Features 1、Ideal model for teaching, for students, for the education of biological class and lboratory research. 2、Vivid and detailed image, restore the details of DNA model, give the students deepest effect on the biology class. 3、Training color recognition ability, hand capacity and imagination, motivate potential. 4、Smooth surface of the model without burrs, without damage to children's hands, effectively develop children's intelligence. 5、It is a demonstration model of biology teaching in school and can also be used as reference for biology major in colleges and universities. Specification Condition: 100% Brand New Item Type: DNA Model Material: PVC Use: 1. The base is connected to deoxyribose with a thick rod. 2. Phosphoric acid is connected to deoxyribose by a thin rod. 3. The bases should be paired, A to T, C to G. 4. The ratio of bases in the molecular structure of DNA is (A+G) /(T+C)=1. 5. Polynucleotide double chains, rotating 360° around a major axle, can form a trapezoidal DNA double helix. Each helix contains 10 base pairs. Package List 10 x Connector Rod 20 x White Ball 20 x Blue Ball 40 x White Connector Rod