DNA is essentially a very large molecule that contains the blueprints for life. Building this unpainted DNA model will help you understand the basic structure of this amazing molecule! Kit includes twenty 2.5cm Styrofoam balls, twenty 2.5cm - 1.3cm Styrofoam balls, ten 5.1cm - 1.3cm rods, ten 5.1cm rods, ten 7.6cm chenille stems two 110cm chenille stems, 36cm - 1.3cm reinforcement wire 10cm x 13cm display stand and complete instructions. Certified Lead Free. Recommended for children ages 14 and up. Made in USA.