Easy to construct the three dimensional model of DNA. Emphasising the base pair sequence and function of DNA, the sturdy, colourful bases snap together in the correct sequence, and the pairs attach to a centre rod representing hydrogen bonds. Two flexible strands signifying alternating pentose and phosphate units attach to the end of each pair, forming the double helix. Once completed, model can be rotated on its sturdy base. Includes enough materials to construct one models. Supplied with manual.