DNA Model for school

Simple model of the DNA. I needed to make this model for a presenation at school. Feel free to use it in class or other places. Use different Colors for the different Bases. May do it like i did it in the rendering.
Decide and Calculate which and how many of the bases you need. In total you should come to at least 24 bases and two Strings.
NOTE!
Only one Base will fit in the one of your bases so keep an eye on the number which should be the same for each type of Base. (Base 1 with Base 2 and Base 3 with Base 4)